IllustrationTHE VEHICLE COOLANT ENDED UP IN THE TRANSMISSION. PROBABLE PROBLEM WITH HOSES OR CONNECTION. *JB
1998 Mercedes Benz ML320
Owner reports · Recalls · Investigations
More warning signs than most ML320 years
Owner complaints for the 1998 Mercedes Benz ML320 are substantially higher than the model-year median of 28.
About this comparison →How this year compares
Owner complaints by model year
Compare all ML320 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
20–25K
625–50K
1150–75K
1275–100K
8100–150K
4150K+
43 reports with mileage · 90 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 And Engine Cooling. Review the 31 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Electrical System. Review the 21 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Visibility. Review the 17 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
NHTSA owner reports · September 18, 2026 snapshot.
9 crash reports5 fire reports10 injury reports
Engine And Engine Cooling complaints
31 reportsTHE HARMONIC BALANCE THAT IS LOCATED IN THE CRANKSHAFT WENT OUT AND CAUSED THE LOSS OF POWER STEERING AND CONTROL. DEALER INFORMED THE CONSUMER THAT THE DAMPER PULLEY HAD SEPARATED.*AK
THE CONSUMER PULLED INTO THE DRIVEWAY WHERE BOTH LIGHTS HAD COME ON AT THE SAME TIME AND HAD BECOME UNABLE TO STEER THE VEHICLE. THE BATTERY LIGHT CAME ON, BECAUSE THE BELT CAME OFF THE ALTERNATOR, POWER STEERING, AND THE AC, WHICH MADE THE VEHICLE DIFFICULT TO STEER. *SCC *JB
THE SERPENTINE BELT HAD BROKEN WHILE DRIVING AT 45MPH AND CAUSED THE ENGINE TO OVERHEAT. MANUFACTURER WAS NOTIFIED. *AK THE CONSUMER STATED THAT AFTER THE INVESTIGATION PER GARRETT ENGINEERING, THE VEHICLE WAS DETERMINED TO HAVE A CRANK SHAFT PULLEY FAILURE WHICH CAUSED THE OTHER SYSTEMS TO FAIL. THE BELTS, ALTENATOR, AND TH…
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THE SERPENTINE BELT HAD BROKEN WHILE DRIVING AT 45MPH AND CAUSED THE ENGINE TO OVERHEAT. MANUFACTURER WAS NOTIFIED. *AK THE CONSUMER STATED THAT AFTER THE INVESTIGATION PER GARRETT ENGINEERING, THE VEHICLE WAS DETERMINED TO HAVE A CRANK SHAFT PULLEY FAILURE WHICH CAUSED THE OTHER SYSTEMS TO FAIL. THE BELTS, ALTENATOR, AND THE COOLING SYSTEMS FAILED AS A RESULT OF THE PULLEY FAILURE. THIS PART WAS SUPPOSED TO BE COVERED UNDER THE 80K WARRANTY, BUT HAS NOT BEEN HONORED. *SCC
VEHICLE HAS BEEN STALLING AT VARIOUS SPEEDS SINCE PURCHASE, DEALER HAS EXAMINED VEHICLE NUMEROUS TIMES, BUT CANNOT REMEDY THE PROBLEM.*AK *TT
VEHICLE IS EXPERIENCING CATALYTIC CONVERTERS PROBLEM. *YD
IGNITION KEY DID NOT WORK. HAD TO USE SPARE KEY IN ORDER TO TURN VEHICLE ON.*AK CONSUMER STATES WITHOUT WARNING, AT STARTUP, WHILE STOPPED, OR MOVING, VEHICLE WILL STALL, CONSUMER STATES IF YOU HAVE A SPARE KEY, SOMETIMES IT WILL WORK. *SLC
MY 1998 MLK 320 IS GOING INTO THE SHOP FOR THE TENTH TIME IN 31 MONTHS, AND THE ONLY REASON IT HASN'T BEEN IN MORE OFTEN IS I LIVE 30 MILES FROM THE DEALER. THE CAR HAS BEEN A NIGHTMARE. THE PROBLEMS ARE NUMEROUS; MANY HAVE NEVER BEEN SUCCESSFULLY REPAIRED. THE MAIN PROBLEM THAT STARTED NOT LONG AFTER I PURCHASED THE CAR (NEW…
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MY 1998 MLK 320 IS GOING INTO THE SHOP FOR THE TENTH TIME IN 31 MONTHS, AND THE ONLY REASON IT HASN'T BEEN IN MORE OFTEN IS I LIVE 30 MILES FROM THE DEALER. THE CAR HAS BEEN A NIGHTMARE. THE PROBLEMS ARE NUMEROUS; MANY HAVE NEVER BEEN SUCCESSFULLY REPAIRED. THE MAIN PROBLEM THAT STARTED NOT LONG AFTER I PURCHASED THE CAR (NEW) IS, WHEN I START IT THE CAR DIES. I HAVE TO REPEAT THE PROCESS AND EVENTUALLY THE CAR WILL START. THERE ARE ALSO A MYRIAD OF SMALL, CONTINUOUS PROBLEMS; WINDOWS THAT WON'T GO UP, LOCKS THAT LOCK AND UNLOCK ON THEIR OWN, PLASTIC PARTS THAT HAVE FALLEN OFF. IT HAS IS AWFUL. IT MAKES MY 95 FORD RANGER TRUCK SEEM LIKE A DREAM AUTO.
THE REAR LOWER CONTROL ARM FAILED AND TOOK TWO WEEKS TO HAVE REPAIRED. NLM
SMOG PUMP FAILED. YH
Official recalls
0No recalls in this snapshot.
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
1PE03058 · Engine Crankshaft Pulley Failure
Opened Dec 17, 2003 · Closed Apr 22, 2004
Status: closed (inferred from source dates) · Engine And Engine Cooling:engine:gasoline:belts And Associated Pulleys
THE OFFICE OF DEFECTS INVESTIGATION (ODI) OPENED THIS PRELIMINARY EVALUATION TO INVESTIGATE ALLEGATIONS OF ENGINE CRANKSHAFT PULLEY HARMONIC BALANCER FAILURE THAT COULD RESULT IN LOSS OF POWER-STEERING ASSIST.ODI HAS RECEIVED A TOTAL OF 546 NON-DUPLICATIVE REPORTS THAT ALLEGE ENGINE CRANKSHAFT PULLEY HARMONIC BALANCER FAILURE ON ALL MERCEDES-BENZ VEHICLES USING THE SUBJECT COMPONENT.THE SUBJECT COMPONENT FAILURES ARE PROGRESSIVE IN NATURE AND ONLY A SMALL PERCENTAGE OF THE COMPLAINTS AND WARRANT CLAIMS INVOLVED A FAILURE THAT HAD PROGRESSED FAR ENOUGH TO EFFECT POWER STEERING PERFORMANCE (6 OF 55 ODI COMPLAINTS REFERENCE INCREASED STEERING EFFORT).THERE HAVE BEEN NO CRASHES OR INJURIES RELATED TO THE ALLEGED DEFECT.A SAFETY-RELATED DEFECT HAS NOT BEEN IDENTIFIED AT THIS TIME AND FURTHER USE OF AGENCY RESOURCES DOES NOT APPEAR TO BE WARRANTED.ACCORDINGLY, THIS INVESTIGATION IS CLOSED.THE CLOSING OF THIS INVESTIGATION DOES NOT CONSTITUTE A FINDING BY NHTSA THAT A SAFETY-RELATED DEFECT DOES NOT EXIST.THE AGENCY WILL TAKE FURTHER ACTION IF WARRANTED BY THE CIRCUMSTANCES.SEE SUMMARY REPORT ATTACHED FOR FURTHER DETAIL.