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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.

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When problems were reported

Mileage at the reported incident

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 reports
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180,000 miles · May 14, 2012
Electrical SystemEngine And Engine CoolingEquipment

TL* THE CONTACT OWNS A 1998 MERCEDES BENZ ML320. THE CONTACT STATED THAT THE VEHICLE WAS BEING REPAIRED BY AN INDEPENDENT MECHANIC FOR UNRELATED ISSUES WHEN SHE WAS INFORMED THAT THE IGNITION KEY NEEDED TO BE REPLACED BECAUSE IT NO LONGER FUNCTIONED PROPERLY. THE CONTACT WAS NOT INFORMED AS TO WHY THE FAILURE OCCURRED. THE KEY W…

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TL* THE CONTACT OWNS A 1998 MERCEDES BENZ ML320. THE CONTACT STATED THAT THE VEHICLE WAS BEING REPAIRED BY AN INDEPENDENT MECHANIC FOR UNRELATED ISSUES WHEN SHE WAS INFORMED THAT THE IGNITION KEY NEEDED TO BE REPLACED BECAUSE IT NO LONGER FUNCTIONED PROPERLY. THE CONTACT WAS NOT INFORMED AS TO WHY THE FAILURE OCCURRED. THE KEY WAS NOT REPLACED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE AND THE CONTACT WAS INFORMED THAT IN ORDER TO REMEDY THE FAILURE, THE VEHICLE WOULD NEED AN ENTIRE NEW IGNITION SYSTEM. THE VEHICLE WAS NOT REPAIRED. THE FAILURE MILEAGE WAS 180,000. THE CONSUMER DISCOVERED DURING RESEARCH THAT MERCEDS BENZ INSTALLED AN INADEQUATE COMPUTER SYSTEM IN HER VEHICLE. THE SYSTEM WOULD ONLY ALLOW EIGHT KEYS TO BE MADE FOR THE LIFETIME OF THE VEHICLE. THE CONSUMER FELT IT WAS A SCAM BY MB TO FORCE THEIR CUSTOMERS TO PURCHASE A NEW COMPUTER, IGNITION, ETC, FOR THE VEHICLE AFTER THE 8TH KEY HAD BEEN MADE. THEY CLAIMED IT WAS MADE THAT WAY FOR SECURITY REASON. THE CONSUMER CALLED TWO DEALERSHIPS AND WAS GIVEN A PRICE OF $4,000 TO $5,000. THE CONSUMER FINALLY HAD THE KEY, COMPUTER AND OTHER PARTS REPLACED BY A LOCKSMITH FOR $1,400. THE RADIATOR, AIR CONDITION AND TWO MIRROR ALSO HAD TO BE REPLACED. UPDATED 07/11/12

NHTSA ODI #10458322

148,000 miles · Jul 18, 2007
Engine And Engine Cooling

HARMONIC BALANCER BROKE APART AT 140K , NO INDICATION OF FAILURE, JUST LOTS OF SMOKE AND NO STEERING CAPABILITIES, WAS IN THE MIDDLE OF THE INTERSECTION. POLICE PUSHED ME TO SAFETY. PLASTIC SHATTERED EVERYWHERE IN ENGINE COMPARTMENT.. THE DEFECT WAS THE PLASTIC PULLY, INTERNET RESEARCH SHOWED OTHER PEOPLE HAD SAME PROBLEM A…

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HARMONIC BALANCER BROKE APART AT 140K , NO INDICATION OF FAILURE, JUST LOTS OF SMOKE AND NO STEERING CAPABILITIES, WAS IN THE MIDDLE OF THE INTERSECTION. POLICE PUSHED ME TO SAFETY. PLASTIC SHATTERED EVERYWHERE IN ENGINE COMPARTMENT.. THE DEFECT WAS THE PLASTIC PULLY, INTERNET RESEARCH SHOWED OTHER PEOPLE HAD SAME PROBLEM AND COST THEM THOUSANDS. *TR

NHTSA ODI #10196654

Mileage unknown · Jan 5, 2007
Engine And Engine Cooling

1998, MERCEDES ML320, 70,000 MILES, BOTH CATALYTIC CONVERTERS NEED TO BE REPLACED. THERE IS A MAJOR CAMPAIGN FOR RECALL ON THIS PART FOR MERCEDES TO REPLACE AT NO COST TO THE OWNER, HOWEVER, THE YEAR OF THE CAR IS IN QUESTION. THIS INCIDENT HAPPENED 4 MONTHS AFTER THE 8 YEAR WARRANTY RAN OUT.

NHTSA ODI #10177846

139,000 miles · Feb 22, 2006
Engine And Engine Cooling

WHILE DRIVING IN TRAFFIC, THE VEHICLE SEEMS TO BE LEAKING EXHAUST DIRECTLY INTO THE PASSENGER COMPARTMENT CAUSING ME TO HAVE SEVERE HEADACHES AND FEEL VERY TIRED. IT HELPS SOMEWHAT WITH THE ODOR WHEN THE HVAC IS SWITCHED TO RECIRCULATE, BUT I FEEL THAT CO IS STILL SEEPING IN THE VEHICLE. *NM

NHTSA ODI #10150915

Mileage unknown · Dec 30, 2005
Engine And Engine Cooling

CATALYTIC CONVERTER NEEDS REPLACING. ENGINE IS SOUNDING VERY LOUD. THE CHECK ENGINE LIGHT IS ON. PART WAS ORDERED IN SEPTEMBER 2005. AS OF TODAY, 12/30/05, THE PART IS STILL NOT AVAILABLE. THE MERCEDES ACCOUNT MANAGER SAID OVER 1200 CATALYTIC CONVERTERS ARE ON BACK ORDER FOR THE US AND THERE ARE 2 PEOPLE WHO HAVE BEEN WAITING LO…

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CATALYTIC CONVERTER NEEDS REPLACING. ENGINE IS SOUNDING VERY LOUD. THE CHECK ENGINE LIGHT IS ON. PART WAS ORDERED IN SEPTEMBER 2005. AS OF TODAY, 12/30/05, THE PART IS STILL NOT AVAILABLE. THE MERCEDES ACCOUNT MANAGER SAID OVER 1200 CATALYTIC CONVERTERS ARE ON BACK ORDER FOR THE US AND THERE ARE 2 PEOPLE WHO HAVE BEEN WAITING LONGER THAN US IN AUSTIN FOR THE PART. HE SAID IT MAY BECOME A RECALL. WHY ARE SO MANY OF THESE PARTS ALL FAILING AT THE SAME TIME THAT SUPPLY CANNOT KEEP UP WITH DEMAND? I FEEL MY VEHICLE MAY BE UNSAFE TO DRIVE AND HAVE NO ACCESS TO A PART TO CORRECT THE DEFECT. *NM

NHTSA ODI #10146535

145,000 miles · Nov 2, 2005
Electrical SystemEngine And Engine Cooling

OUR 1998 MERCEDES M320 HAS BEEN SUBJECT TO UNEXPECTED STALLING FOR SOME TIME. MORE RECENTLY THIS HAS INCREASED IN FREQUENCY AND WE HAVE PERIODS OF LOSS (REDUCTION) OF POWER WHILE DRIVING. THE DEALER ADVISES THAT WE HAVE DETERIORATION OF THE CATALYTIC CONVERTERS AND THAT THERE HAS BEEN A RECALL FOR THIS PROBLEM ON NEWER MODELS OF…

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OUR 1998 MERCEDES M320 HAS BEEN SUBJECT TO UNEXPECTED STALLING FOR SOME TIME. MORE RECENTLY THIS HAS INCREASED IN FREQUENCY AND WE HAVE PERIODS OF LOSS (REDUCTION) OF POWER WHILE DRIVING. THE DEALER ADVISES THAT WE HAVE DETERIORATION OF THE CATALYTIC CONVERTERS AND THAT THERE HAS BEEN A RECALL FOR THIS PROBLEM ON NEWER MODELS OF THE M CLASS - BUT NOT OUR YEAR. WE HAVE THE CAR AT THE DEALER WAITING FOR REPLACEMENT PARTS. WE ARE TOLD IT WILL BE A NUMBER OF WEEKS SINCE THE PARTS ARE IN GREAT DEMAND. REPAIRS WILL COST OVER $2,000 - BUT THE CAR IS CLEARLY UNSAFE. MOST FREQUENT STALLS ARE STARTING AT A LIGHT OR STOP SIGN. ONE CONCERN IS KNOWING THIS PROBLEM WITH MODEL YEARS JUST NEWER THAN OURS ARE SUBJECT TO RECALL WHILE OUR YEAR ISN'T. THE OTHER ISSUE IS HOW DIFFICULT IT WAS FOR THE DEALER TO IDENTIFY THE PROBLEM UNTIL IT BECAME VERY SEVERE (OR THEY LEARNED OF THE SOLUTION DUE TO THE RECALL OF OTHER YEARS. *JB

NHTSA ODI #10141589

Mileage unknown · Sep 29, 2005
Engine And Engine Cooling

THE RIGHT SIDE CATALYTIC CONVERTER SPLIT AT THE NECK. WHILE THE LOCAL MERCEDES BENZ DEALER FREELY ADMITS THAT THIS IS A COMMON PROBLEM ON THIS CLASS OF CAR AND THAT THERE IS A RECALL ON THIS VERY PROBLEM, THEY TELL ME THAT MY VIN NUMBER IS NOT COVERED AND IF I WANT TO AVOID THE PROBLEMS ASSOCIATED WITH A LEAKING EXHAUST SYSTEM, …

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THE RIGHT SIDE CATALYTIC CONVERTER SPLIT AT THE NECK. WHILE THE LOCAL MERCEDES BENZ DEALER FREELY ADMITS THAT THIS IS A COMMON PROBLEM ON THIS CLASS OF CAR AND THAT THERE IS A RECALL ON THIS VERY PROBLEM, THEY TELL ME THAT MY VIN NUMBER IS NOT COVERED AND IF I WANT TO AVOID THE PROBLEMS ASSOCIATED WITH A LEAKING EXHAUST SYSTEM, I MUST REPLACE IT MYSELF. THIS IS OBVIOUSLY A MUCH WIDER PROBLEM THAN MERCEDES BENZ IS WILLING TO ADMIT TO. *JB

NHTSA ODI #10138149

85,000 miles · Aug 9, 2005
Engine And Engine Cooling

HARMONIC BALANCE PULLEY WAS FAILED AND WAS RECALLED 1998 MERCEDES ML320 -[XXX]. MERCEDES REFUSED TO PAY TOTAL LABOR FOR PROCESS. VEHICLE HAS NO EQUIPMENT OTHER THAN MERCEDES MADE AND INSTALLED EQUIPMENT. VEHICLE HAS MERCEDES FOG LIGHT BAR ON FRONT (STANDARD MERCEDES MADE AND INSTALLED ITEMS). IF THE PART HAD NOT BEEN DEFECTIV…

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HARMONIC BALANCE PULLEY WAS FAILED AND WAS RECALLED 1998 MERCEDES ML320 -[XXX]. MERCEDES REFUSED TO PAY TOTAL LABOR FOR PROCESS. VEHICLE HAS NO EQUIPMENT OTHER THAN MERCEDES MADE AND INSTALLED EQUIPMENT. VEHICLE HAS MERCEDES FOG LIGHT BAR ON FRONT (STANDARD MERCEDES MADE AND INSTALLED ITEMS). IF THE PART HAD NOT BEEN DEFECTIVE, THIS CHARGE WOULD NOT HAVE OCCURRED. REGARDLESS OF THE FACT THAT IS WAS INSTALLED BY MERCEDES BEFORE I GOT THE CAR--I DO NOT FEEL THAT I SHOULD BE BURGEONED WITH MERCEDES COSTS DUE TO POOR QUALITY OF DEFECTIVE PARTS. *NM UPDATED 07/19/2012 *JS INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ODI #10132150

Mileage unknown · Nov 15, 2004
Engine And Engine Cooling

VEHICLE STALLED WHENEVER IT WAS DRIVEN. THERE WERE NO CURRENT RECALLS FOR THIS VEHICLE.*AK

NHTSA ODI #10099959

97,615 miles · May 2, 2004
Electrical SystemEngine And Engine CoolingFuel System, GasolineInjury

LAUNDRY LIST OF FAILURES. JACK HAS ALMOST KILLED ME WHILE CHANGING TIRE. VEHICLE FELL, ALMOST HITTING ME BUT CATCHING SIDE OF VEHICLE BEFORE LANDING ON ME! HOOD LATCH HAS FAILED ON A FEW OCCASIONS, CAUSING HOOD TO OPEN WHILE VEHICLE WAS IN MOTION. AIR MASS METER FAILED. HAS REQUIRED 5 (FIVE!) ALIGNMENTS IN TWO YEARS. WHEN …

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LAUNDRY LIST OF FAILURES. JACK HAS ALMOST KILLED ME WHILE CHANGING TIRE. VEHICLE FELL, ALMOST HITTING ME BUT CATCHING SIDE OF VEHICLE BEFORE LANDING ON ME! HOOD LATCH HAS FAILED ON A FEW OCCASIONS, CAUSING HOOD TO OPEN WHILE VEHICLE WAS IN MOTION. AIR MASS METER FAILED. HAS REQUIRED 5 (FIVE!) ALIGNMENTS IN TWO YEARS. WHEN BROUGHT TO DEALER'S ATTENTION, WAS TOLD NOTHING WAS WRONG. A MONTH LATER REQUIRES ANOTHER ALIGNMENT. ALIGNMENT PROBLEMS CAUSES WEAR ON TIRES, WHICH HAS CAUSED HYDROPLANING AND LOSS OF CONTROL OF VEHICLE. VEHICLE SWERVES UNCONTROLLABLY WHEN HITS ANYTHING OTHER THAN FLAT ROAD. TRANSFER CASE MOTOR FIXED BY DEALER WITHOUT CONSULTING. AFTER REPAIR, TRANSFER CASE MOTOR FAILED. DEALER STATES OWNER RESPONSIBLE FOR COSTS. HAS HAD REPAIR OF HARMONIC BALANCER ON FRONT OF ENGINE DUE TO EXCESSIVE HEAT BUILDUP LEADING TO OIL LEAK AND FAILURE OF BELT TENSIONER. WINDOW SWITCHES HAVE FAILED TWICE AND FIXED AT EXPENSE OF OWNER. SIX DIFFERENT KEYS HAVE FAILED @ THE COST OF $220/KEY. REAR WINDOW DEFROSTER CAUSES LOSS OF STEREO RECEPTION. REAR WINDOW WIPER MOTOR HAS FAILED. FRONT END MAKES NOISE.*AK

NHTSA ODI #10068171

Official recalls

0

No 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

1

PE03058 · 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.