IllustrationHad recall for EGR cooler now getting check engine light with code P26B1
2015 BMW X5
Owner reports · Recalls · Investigations
Similar to other model years
Owner complaints for the 2015 BMW X5 do not stand out strongly from the model-year median of 100.5.
About this comparison →How this year compares
Owner complaints by model year
Compare all X5 years →Counts vary with age, sales and reporting. They are not failure rates.
What owners reported most
All reported categories
Tap a category to read its complaints. One report may name several components.
When problems were reported
Mileage at the reported incident
120–25K
925–50K
1650–75K
1275–100K
15100–150K
7150K+
71 reports with mileage · 81 unknown
NHTSA’s mileage field refers to the reported incident, not necessarily the filing date. This shows report counts, not the likelihood of a failure.
What to inspect
Issues worth paying extra attention to based on owner reports.
- Engine. Review the 42 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Fuel/propulsion System. Review the 30 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Fuel System, Diesel. Review the 20 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
NHTSA owner reports · September 18, 2026 snapshot.
6 crash reports7 fire reports5 injury reports
Engine complaints
42 reportsThe contact owns a 2015 BMW X5. The contact stated while driving 50 MPH, the vehicle stalled with the drivetrain warning light was displayed. Due to the failure, the vehicle was towed to an independent mechanic, and it was discovered that the chain connected to the high-pressure fuel pump fractured and bent the valves. The mecha…
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The contact owns a 2015 BMW X5. The contact stated while driving 50 MPH, the vehicle stalled with the drivetrain warning light was displayed. Due to the failure, the vehicle was towed to an independent mechanic, and it was discovered that the chain connected to the high-pressure fuel pump fractured and bent the valves. The mechanic diagnosed the vehicle with engine failure due to the malfunction. The mechanic notified the manufacturer of the failure and was informed that there were no recalls on the vehicle. The vehicle had yet to be repaired. The failure mileage was approximately 113,000.
There was a recall on my 2013 BMW in January 2022. In the recall letter it was mentioned that the they would notify me when the recall repairs were available. I called my local BMW service center in July 2022 to ask if the part was available. It was stated that the part was not available. The representative stated what was i…
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There was a recall on my 2013 BMW in January 2022. In the recall letter it was mentioned that the they would notify me when the recall repairs were available. I called my local BMW service center in July 2022 to ask if the part was available. It was stated that the part was not available. The representative stated what was in the recall letter, which was. "this time. We will notify you with a follow-up letter as soon as we are able to perform this safety recall. What could happen? The engine’s Exhaust Gas Recirculation (EGR) Cooler could develop an internal leak. Cooling fluid could mix with typical diesel engine soot deposits. With high temperatures normally present in the EGR module, this might result in smoldering particles. In some cases, these particles could contact the engine intake manifold and create small holes due to melting. If this occurs, it would increase the risk of a fire. Your vehicle may be experiencing this issue if one or more of the following occurs; a reduction in engine power, a warning symbol indicating a loss of engine coolant, an unpleasant odor (e.g., exhaust) and/or an unusual noise from the engine. If this occurs, carefully move away from traffic and pull over to a safe location as soon as possible. All occupants should carefully exit the vehicle and move to a safe location away from traffic. Do not continue to drive the vehicle. SAMPLE If you are not the only driver of this vehicle, please advise all other drivers and passengers of this important information." My daughter was driving the car an almost home when she started to smell burning and minutes later saw smoke and flames. She got out of the call and called 911. The care was a total loss, due to this recall and BMW is taking no responsibility for the loss. She is still recovering from the incident and I would like to take action against BMW. I have the police and fire department report from the town of MIlton.
Engine and engine cooling: exhaust system: emission control: gas recirculation valve (egr valve)melting intake manifold
I received a warning light and checked with my OBDII reader that the Diesel Exhaust Fluid transfer pump had a implausible reading and was not working. This is a key part of the Selective Catalytic Reduction (SCR) system, part of the emissions control system, and will make the vehicle fault to the point where it will lock the car…
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I received a warning light and checked with my OBDII reader that the Diesel Exhaust Fluid transfer pump had a implausible reading and was not working. This is a key part of the Selective Catalytic Reduction (SCR) system, part of the emissions control system, and will make the vehicle fault to the point where it will lock the car from being driven (no start condition).
Some engine rumbling at normal operation, and noticed a yellow check-engine light, not filled (meaning not a catastrophic issue). Attached my OBDII reader and found error: 24BF00 Injector, cylinder 2, zero-quantity adaptation - permitted filtered actuation duration correction too high. A google search confirmed this fault is co…
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Some engine rumbling at normal operation, and noticed a yellow check-engine light, not filled (meaning not a catastrophic issue). Attached my OBDII reader and found error: 24BF00 Injector, cylinder 2, zero-quantity adaptation - permitted filtered actuation duration correction too high. A google search confirmed this fault is covered in https://static.nhtsa.gov/odi/tsbs/2020/MC-10184567-9999.pdf with BMW, but my model year and vehicle is not included. I have an F15, 2015 X5, build date 12/2014. This year is covered on other vehicles with the same N57 engine, and so I would suspect that the same issue plaguing the same engine on other models should be applicable here. I would like consideration for additional model years to be added to the SIB.
The contact owns a 2015 BMW X5. The contact stated while driving at approximately 70 MPH, she began to notice smoke coming from passenger side on the hood. The vehicle was serviced under NHTSA Campaign Number: 18V755000( Engine and Engine Cooling) but the remedy failed to repair the vehicle. The contact mentioned that instrument…
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The contact owns a 2015 BMW X5. The contact stated while driving at approximately 70 MPH, she began to notice smoke coming from passenger side on the hood. The vehicle was serviced under NHTSA Campaign Number: 18V755000( Engine and Engine Cooling) but the remedy failed to repair the vehicle. The contact mentioned that instrument cluster failed to provide safety messages. The contact stated the instrument cluster only notified her of issues when she attempted to open the engine hood door. The manufacturer was not notified of the failure and offered no assistance. The failure mileage was 49,000.
Rod bearing failure causing engine to be damaged. The car has 79k miles, fully maintained at a BMW dealership. My wife and toddler were driving on the highway when the car shut off with no warning. We towed the car to the same BMW dealer where we’ve had the car serviced since 34,673 miles.. The dealer documented metal flakes in …
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Rod bearing failure causing engine to be damaged. The car has 79k miles, fully maintained at a BMW dealership. My wife and toddler were driving on the highway when the car shut off with no warning. We towed the car to the same BMW dealer where we’ve had the car serviced since 34,673 miles.. The dealer documented metal flakes in the oil filter. The dealer confirmed a rod bearing spun causing a catastrophic failure to the engine requiring replacement. Initial quote exceeding price of car at $74k. BMW Corporate contacted me and offered a discount on a new engjne. I declined the offer because the repair work was $32,843. This rod bearing issue is a known problem among 2015-2018 BMW X5M owners. This problem in fact existed on a previous generation engine which is referred to as the S65 motor. BMW has released a bulletin to this group of owners guaranteeing replacement based on the amount of miles on a customers engine. In some cases, a free engine was provided by BMW at no cost to the customer. The car only had 79k miles and without BMW NA involved the dealer wanted $74,332 to replace and repair vehicle. The BMW supervisor on this case is Lindsay and she can be reached at (800) 831-1117 ext. 115. She disregarded this was a safety matter and thought other owners shouldn’t be compensated or warned about this complete loss of power while driving this particular model (2015-2018 BMW X5M). This is an unacceptable outcome for a car with a MSRP is over $100,000. I’ve talked to half a dozen other 2015-2018 BMW X5M owners who also had total engine failure due to this same rod bearing issue. All of the cases the engine exceeded the cost or current market value of car.
I have a recall notice for an EGR cooler in my 2015 BMW x5 diesel. At first there was no part available, for at least a year. Now a part has been available since September 2022. I sold the vehicle to my son in Roanoke, VA in September 2022. His dealer claims he can't get the part. This is a SAFETY issue. My original dealer…
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I have a recall notice for an EGR cooler in my 2015 BMW x5 diesel. At first there was no part available, for at least a year. Now a part has been available since September 2022. I sold the vehicle to my son in Roanoke, VA in September 2022. His dealer claims he can't get the part. This is a SAFETY issue. My original dealer in California had the part, but is telling my son he no longer has a part and in order to get a part from the warehouse, my son's Roanoke dealer HAS to be part of the Penske auto system. The Roanoke, VA dealer was sold around September 2022 and has been totally inept, can't get the part, made some other repair which was incorrect and now my son is driving a safety defective vehicle. This may not be the proper place to make a report, however the recall notice says to make a report, gives a website and says I can get information at the website, but not true. Additionally, the printed phone number does not work.
I purchased the vehicle in Feb 2022. I received a call from my dealer about the recall last week, they said they would perform the repair on 01/26/23. I picked the vehicle up the next day without them having performed the repair because the VIN still shows "remedy not available". The dealer did not even assess the safety issue…
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I purchased the vehicle in Feb 2022. I received a call from my dealer about the recall last week, they said they would perform the repair on 01/26/23. I picked the vehicle up the next day without them having performed the repair because the VIN still shows "remedy not available". The dealer did not even assess the safety issue when the car was brought in. I do not know if the car is safe to drive. Neither the dealer nor BMW have set expectations for when the recall is to be performed. What do I do next?
Official recalls
621V907000 · Fuel System, Diesel
Nov 19, 2021
BMW of North America, LLC (BMW) is recalling certain 2013-2018 328d, 328d xDrive, 2014-2018 328d Sports Wagon, 328d xDrive Sports Wagon, 2014-2016 535d, 535d xDrive, 2015 740Ld xDrive, 2015-2017 X3 xDrive28d SAV, and 2014-2017 X5 xDrive35d SAV diesel vehicles equipped with an Exhaust Gas Recirculation (EGR) module with an integrated cooler. The EGR cooler may leak internally, causing coolant to mix with diesel engine soot, which could result in smoldering particles and a melting intake manifold.
Consequence & remedy
Consequence: A melting intake manifold increases the risk of a fire.
Remedy: Dealers will replace the EGR cooler and inspect the intake manifold, replacing it as necessary, free of charge. This recall includes all vehicles previously recalled under 18V-755. Vehicles previously recalled under 18V-755 will need to have the new remedy performed for this recall. An interim owner notification letter was mailed on January 18, 2022. The remedy is expected to be available in June 2022. Owner notification letters were mailed on July 6, 2022. Owners may contact BMW customer service at 1-800-525-7417.
21V586000 · Fuel System, Diesel:delivery:fuel Pump
Jul 29, 2021
BMW of North America, LLC (BMW) is recalling certain 2014-2018 328d, 328d xDrive, X5 xDrive35d, 2014-2016 535d, 535d xDrive, 2015 740Ld xDrive, and 2015-2017 X3 xDrive28d vehicles. The high-pressure fuel pump may fail.
Consequence & remedy
Consequence: Fuel pump failure can cause an engine stall while driving, increasing the risk of a crash.
Remedy: Dealers will replace the high-pressure fuel pump, free of charge. Owner notification letters were mailed on January 14, 2022. Owners may contact BMW customer service at 1-800-525-7417.
18V755000 · Engine And Engine Cooling:exhaust System:emission Control:gas Recirculation Valve (egr Valve)
Oct 25, 2018
BMW of North America, LLC (BMW) is recalling certain 2013-2018 BMW 328d and 328d xDrive, 2014-2018 328d Sports Wagon and 328d xDrive Sports Wagon, 2014-2016 535d and 535d xDrive, 2015 740Ld xDrive, 2015-2017 X3 xDrive28d SAV and 2014-2017 X5 xDrive35d SAV vehicles equipped with an Exhaust Gas Recirculation (EGR) module with an integrated cooler. If the EGR cooler leaks internally, the coolant can mix with diesel engine soot. The high EGR temperatures may result in these particles possibly smoldering and melting the intake manifold.
Consequence & remedy
Consequence: The melting intake manifold can increase the risk of a fire.
Remedy: BMW will notify owners, and dealers will inspect and replace the EGR cooler as necessary. If a leak has already occurred, the engine intake manifold will also be replaced. These repairs will be made free of charge. The recall began May 13, 2019. Owners may contact BMW customer service at 1-800-525-7417.
16V683000 · Air Bags:frontal:driver Side:inflator Module
Sep 21, 2016
BMW of North America, LLC. (BMW) is recalling certain model year 2015 BMW X3 sDrive28i, X3 xDrive28i, X3 xDrive35i, X3 xDrive28d, X4 xDrive28i and X4 xDrive35i vehicles, and model year 2014-2015 X5 xDrive35i, X5 sDrive35i, X5 xDrive50i, and 2014 X5 xDrive35d vehicles. The affected vehicles have a driver's frontal air bag inflator that may have been improperly welded.
Consequence & remedy
Consequence: In the event of a crash necessitating deployment of the driver's frontal air bag, the inflator housing could separate from the base plate and result in metal striking the vehicle occupants, potentially resulting in serious injury or death.
Remedy: BMW will notify owners, and dealers will replace the driver's front air bag, free of charge. The recall began on November 1, 2016. Owners may contact BMW customer service at 1-800-525-7417.
15V147000 · Air Bags
Mar 13, 2015
BMW of North America, LLC (BMW) is recalling certain model year 2015 BMW X5 xDrive 35d Sports Activity Vehicles (SAV) manufactured August 19, 2014, to February 16, 2015, and 2014-2015 BMW X5 xDrive 35i, X5 sDrive 35i, X5 xDrive 50i, Sports Activity Vehicles (SAV) manufactured August 28, 2013, to February 16, 2015. In the affected vehicles, the Head Protection System (HPS) air bag may not be securely connected to the air bag inflator gas generator.
Consequence & remedy
Consequence: Without a secure connection to the inflator, the HPS air bags may have insufficient inflation during a vehicle crash, increasing the risk of injury.
Remedy: BMW will notify owners, and dealers will replace the Head Protection System, free of charge. The recall began on June 24, 2015. Owners may contact BMW customer service at 1-800-525-7417.
14V650000 · Seats
Oct 17, 2014
BMW of North America, LLC (BMW) is recalling certain model year 2015 X5 vehicles manufactured September 12, 2014,to September 21, 2014 and equipped with the optional rear comfort seat. The left rear seat belt attachment point in the affected vehicles may not have been sufficiently welded.
Consequence & remedy
Consequence: In the event of a crash, the seat belt attachment could break and fail to restrain a seat occupant, increasing the risk of injury.
Remedy: BMW will notify owners, and dealers will replace the left rear seat frame, free of charge. The recall began November 2014. Owners may contact BMW customer service at 1-800-525-7417 or CustomerRelations@bmwusa.com.
Model-level recall history does not show whether a particular VIN is affected or has received a repair. Check a VIN with NHTSA ↗
NHTSA investigations
2EA23001 · High Pressure Fuel Pump Failure
Opened Mar 17, 2023 · No close date supplied
Status: open (inferred from source dates) · Fuel System, Diesel:delivery:fuel Pump
The Office of Defects Investigation (ODI) opened PE21-021 on October 14, 2021, to investigate incidents alleging a stall/loss of motive power as a result of high-pressure fuel pump failures in certain model year (MY) 2019-2020 Ram 2500, 3500, 4500, and 5500 heavy duty trucks equipped with 6.7L Cummins turbodiesel engines. During the investigation, ODI sought to determine if the related defect allegation was limited in scope to the recalled population. After review of information request response materials from both FCA and BMW, NHTSA determined that sufficient information to identify a comprehensive recall population could not be produced by FCA and BMW.During the investigation FCA filed recalls 22V406, 22E048, 22V767, and 22E087 which include vehicles not identified in the initial subject population by ODI. ODI also received recall 21V586, involving loss of motive power due to failed CP4 fuel pumps on certain BMW manufactured vehicles. An information request letter response received from BMW indicated that failed pumps on their vehicles were caused by an interaction between pump internal components and US market diesel fuel, leading to increased slip and eventual particle-generating wear surface. Additional work will be done to identify whether a similar root cause is associated with the FCA recalled population and if similar wear dynamics occur on pumps supplied to vehicle manufacturers other than those included in the recalled population.ODI has upgraded this investigation to an EA in order to 1) determine engineering specifications of internal pump components that are correlated with pump failure leading to loss of motive power or other safety related hazards, 2) identify vehicle populations equipped with alleged defective pump variants, 3) assess if vehicles equipped with alleged defective pump variants result in an unreasonable risk to motor vehicle safety and 4) gather and review any other relevant information related to high pressure fuel pump failure associated with the subject populations of recalls 21V586, 21V880, 21E094, 22V406, 22E048, 22V767, and 22E087.Review of the above information will allow NHTSA to confirm root cause and recall remedy viability, and identify and evaluate vehicle populations equipped with pump components that may pose an unreasonable risk to motor vehicle safety.The ODI reports cited above can be reviewed at: http://www-odi.nhtsa.dot.gov/owners/SearchNHTSAID using the following complaint identification numbers: 11257550, 11351441, 11361603, 11361616, 11365300, 11365426, 11365858, 11366401, 11372337, 11373793, 11374797, 11376793, 11377871, 11378173, 11384377, 11386063, 11387018, 11399710, 11402550, 11415339, 11418868, 11418870, 11427075, 11434276, 11436807, 11437226, 11437249, 11437273, 11437292, 11437294, 11437394, 11437399, 11437403, 11437405, 11437423, 11437528, 11437565, 11437579, 11437580, 11437590, 11437679, 11437744, 11437781, 11437842, 11437993, 11438006, 11438008, 11438121, 11438138, 11438155, 11438392, 11438629, 11439359, 11439879, 11440397, 11443030, 11446542, 11448163, 11453556, 11458918, 11460558, 11469337
EA21002 · Desiccated Air Bag Inflator Rupture
Opened Sep 17, 2021 · No close date supplied
Status: open (inferred from source dates) · Air Bags:frontal:driver Side:inflator Module; Air Bags:frontal:passenger Side:inflator Module
From 2000 through 2017, Takata produced millions of air bag inflators using two types of phase-stabilized ammonium nitrate ("PSAN") propellant -- propellant 2004 and propellant 2004L. After prolonged exposure to high temperature cycles and humidity, inflators using propellant 2004 can degrade, causing the propellant to burn too quickly when ignited. The rapid burning can cause the inflator to rupture during deployment, potentially causing serious or even fatal injury to vehicle occupants. See 2016 Blomquist Report at www.nhtsa.gov/sites/nhtsa.gov/files/documents/expert_report-hrblomquist.pdf.Consequently, all frontal inflators using propellant 2004 that do not contain a "desiccant" (a substance that traps and holds moisture) in US vehicles are under recall. These "non-desiccated" inflators either have been or are required to be replaced.In some cases, the remedy part for these recalled inflators was, or will be, an inflator using either propellant 2004 or 2004L that does contain a desiccant. None of these "desiccated" remedy parts (which were installed in older model year vehicles) are currently under recall for a degradation concern. Certain subsets of desiccated PSAN inflators using propellant 2004 for use as original equipment, however, have been recalled for a degradation concern. All Takata inflators produced with propellant 2004L contain desiccant, and none of these desiccated inflators using propellant 2004L are under recall for a degradation concern. There have been no reported field ruptures in any non-recalled desiccated PSAN inflators.It is understood that desiccants fully saturate at some threshold, at which point any additional moisture will not be captured. This means the degradation process observed in non-desiccated inflators using propellant 2004 may also occur in non-recalled desiccated inflators using propellant 2004, assuming additional moisture enters the inflator and high temperature cycling occurs. Based on available information, desiccant saturation can occur within the first five years in the worst environments, and the time required for full saturation is affected by multiple factors. While no present safety risk has been identified, further work is needed to evaluate the future risk of non-recalled desiccated inflators using propellant 2004.Three entities -- Takata (now known as TK Global), the Independent Testing Coalition, and Exponent -- have been studying the long-term behavior of Takata desiccated PSAN inflators using propellant 2004L (as well as 2004) in the presence of moisture and temperature cycling. The research efforts, which include development of predictive modeling techniques and field sample analysis, are ongoing. To date, none of the researchers have identified field evidence showing that propellant 2004L is undergoing a degradation process that leads to aggressive deployment and potential rupture. However, the time in service of such inflators remains short compared to that of the inflators using propellant 2004. Further study is needed to assess the long-term safety of desiccated inflators using propellant 2004L.The Office of Defects Investigation is opening this investigation to examine whether a safety defect related to propellant degradation exists in non-recalled desiccated PSAN frontal inflators manufactured by Takata. This investigation will require extensive information on Takata production processes and surveys of inflators in the field. Lists of recall actions that may have used desiccated PSAN inflators as remedy parts, as well as the makes and models originally manufactured with them, is available with the downloadable version of this document (see nhtsa.gov/recalls?nhtsaId=EA21002 -- note this information is subject to change/revision as the investigation proceeds). This investigation does not supersede EA15-001, which remains open.
Additional source detail variants (2)
Air Bags:frontal:driver Side:inflator Module
From 2000 through 2017, Takata produced millions of air bag inflators using two types of phase-stabilized ammonium nitrate ("PSAN") propellant -- propellant 2004 and propellant 2004L. After prolonged exposure to high temperature cycles and humidity, inflators using propellant 2004 can degrade, causing the propellant to burn too quickly when ignited. The rapid burning can cause the inflator to rupture during deployment, potentially causing serious or even fatal injury to vehicle occupants. See 2016 Blomquist Report at www.nhtsa.gov/sites/nhtsa.gov/files/documents/expert_report-hrblomquist.pdf.Consequently, all frontal inflators using propellant 2004 that do not contain a "desiccant" (a substance that traps and holds moisture) in US vehicles are under recall. These "non-desiccated" inflators either have been or are required to be replaced.In some cases, the remedy part for these recalled inflators was, or will be, an inflator using either propellant 2004 or 2004L that does contain a desiccant. None of these "desiccated" remedy parts (which were installed in older model year vehicles) are currently under recall for a degradation concern. Certain subsets of desiccated PSAN inflators using propellant 2004 for use as original equipment, however, have been recalled for a degradation concern. All Takata inflators produced with propellant 2004L contain desiccant, and none of these desiccated inflators using propellant 2004L are under recall for a degradation concern. There have been no reported field ruptures in any non-recalled desiccated PSAN inflators.It is understood that desiccants fully saturate at some threshold, at which point any additional moisture will not be captured. This means the degradation process observed in non-desiccated inflators using propellant 2004 may also occur in non-recalled desiccated inflators using propellant 2004, assuming additional moisture enters the inflator and high temperature cycling occurs. Based on available information, desiccant saturation can occur within the first five years in the worst environments, and the time required for full saturation is affected by multiple factors. While no present safety risk has been identified, further work is needed to evaluate the future risk of non-recalled desiccated inflators using propellant 2004.Three entities -- Takata (now known as TK Global), the Independent Testing Coalition, and Exponent -- have been studying the long-term behavior of Takata desiccated PSAN inflators using propellant 2004L (as well as 2004) in the presence of moisture and temperature cycling. The research efforts, which include development of predictive modeling techniques and field sample analysis, are ongoing. To date, none of the researchers have identified field evidence showing that propellant 2004L is undergoing a degradation process that leads to aggressive deployment and potential rupture. However, the time in service of such inflators remains short compared to that of the inflators using propellant 2004. Further study is needed to assess the long-term safety of desiccated inflators using propellant 2004L.The Office of Defects Investigation is opening this investigation to examine whether a safety defect related to propellant degradation exists in non-recalled desiccated PSAN frontal inflators manufactured by Takata. This investigation will require extensive information on Takata production processes and surveys of inflators in the field. Lists of recall actions that may have used desiccated PSAN inflators as remedy parts, as well as the makes and models originally manufactured with them, is available with the downloadable version of this document (see nhtsa.gov/recalls?nhtsaId=EA21002 -- note this information is subject to change/revision as the investigation proceeds). This investigation does not supersede EA15-001, which remains open.
Air Bags:frontal:passenger Side:inflator Module
From 2000 through 2017, Takata produced millions of air bag inflators using two types of phase-stabilized ammonium nitrate ("PSAN") propellant -- propellant 2004 and propellant 2004L. After prolonged exposure to high temperature cycles and humidity, inflators using propellant 2004 can degrade, causing the propellant to burn too quickly when ignited. The rapid burning can cause the inflator to rupture during deployment, potentially causing serious or even fatal injury to vehicle occupants. See 2016 Blomquist Report at www.nhtsa.gov/sites/nhtsa.gov/files/documents/expert_report-hrblomquist.pdf.Consequently, all frontal inflators using propellant 2004 that do not contain a "desiccant" (a substance that traps and holds moisture) in US vehicles are under recall. These "non-desiccated" inflators either have been or are required to be replaced.In some cases, the remedy part for these recalled inflators was, or will be, an inflator using either propellant 2004 or 2004L that does contain a desiccant. None of these "desiccated" remedy parts (which were installed in older model year vehicles) are currently under recall for a degradation concern. Certain subsets of desiccated PSAN inflators using propellant 2004 for use as original equipment, however, have been recalled for a degradation concern. All Takata inflators produced with propellant 2004L contain desiccant, and none of these desiccated inflators using propellant 2004L are under recall for a degradation concern. There have been no reported field ruptures in any non-recalled desiccated PSAN inflators.It is understood that desiccants fully saturate at some threshold, at which point any additional moisture will not be captured. This means the degradation process observed in non-desiccated inflators using propellant 2004 may also occur in non-recalled desiccated inflators using propellant 2004, assuming additional moisture enters the inflator and high temperature cycling occurs. Based on available information, desiccant saturation can occur within the first five years in the worst environments, and the time required for full saturation is affected by multiple factors. While no present safety risk has been identified, further work is needed to evaluate the future risk of non-recalled desiccated inflators using propellant 2004.Three entities -- Takata (now known as TK Global), the Independent Testing Coalition, and Exponent -- have been studying the long-term behavior of Takata desiccated PSAN inflators using propellant 2004L (as well as 2004) in the presence of moisture and temperature cycling. The research efforts, which include development of predictive modeling techniques and field sample analysis, are ongoing. To date, none of the researchers have identified field evidence showing that propellant 2004L is undergoing a degradation process that leads to aggressive deployment and potential rupture. However, the time in service of such inflators remains short compared to that of the inflators using propellant 2004. Further study is needed to assess the long-term safety of desiccated inflators using propellant 2004L.The Office of Defects Investigation is opening this investigation to examine whether a safety defect related to propellant degradation exists in non-recalled desiccated PSAN frontal inflators manufactured by Takata. This investigation will require extensive information on Takata production processes and surveys of inflators in the field. Lists of recall actions that may have used desiccated PSAN inflators as remedy parts, as well as the makes and models originally manufactured with them, is available with the downloadable version of this document (see nhtsa.gov/recalls?nhtsaId=EA21002 -- note this information is subject to change/revision as the investigation proceeds). This investigation does not supersede EA15-001, which remains open.