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1999 Mercedes Benz ML320

Owner reports · Recalls · Investigations

More warning signs than most ML320 years

Owner complaints for the 1999 Mercedes Benz ML320 are substantially higher than the model-year median of 28.

About this comparison →

When problems were reported

Mileage at the reported incident

72 reports with mileage · 53 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 35 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Steering. Review the 29 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Power Train. Review the 19 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →

NHTSA owner reports · September 18, 2026 snapshot.

14 crash reports2 fire reports6 injury reports

What owners actually said

125 reports
139,000 miles · Apr 23, 2008
Engine And Engine Cooling

TL*THE CONTACT OWNS A 1999 MERCEDES BENZ ML320. WHILE THE CONTACT'S SPOUSE WAS DRIVING APPROXIMATELY 35 MPH, THE VEHICLE COMPLETELY SHUT OFF WITHOUT WARNING. THE VEHICLE HAD TO BE RESTARTED AND WAS DRIVEN TO A MECHANIC. THE MECHANIC DISCOVERED THAT THE CATALYTIC CONVERTER NEEDED TO BE REPLACED. THE VIN WAS UNKNOWN. THE CURR…

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TL*THE CONTACT OWNS A 1999 MERCEDES BENZ ML320. WHILE THE CONTACT'S SPOUSE WAS DRIVING APPROXIMATELY 35 MPH, THE VEHICLE COMPLETELY SHUT OFF WITHOUT WARNING. THE VEHICLE HAD TO BE RESTARTED AND WAS DRIVEN TO A MECHANIC. THE MECHANIC DISCOVERED THAT THE CATALYTIC CONVERTER NEEDED TO BE REPLACED. THE VIN WAS UNKNOWN. THE CURRENT MILEAGE WAS 150,000 AND FAILURE MILEAGE WAS 139,000.

NHTSA ODI #10225464

58,000 miles · Nov 5, 2007
Steering

POWER STEERING FAILURE - DRIVING THIS LEMON OF AN SUV, CAR STARTED TO PULL AND WAS DIFFICULT TO STEER. THANK GOD, I WAS NOT ON A FREEWAY AND COULD PULL OVER WITHOUT KILLING SOMEONE. *TR

NHTSA ODI #10207955

14,800 miles · Aug 23, 2007
Vehicle Speed Control

TL*THE CONTACT OWNS A 1999 MERCEDES BENZ ML320. WHILE BACKING OUT OF THE DRIVEWAY AT APPROXIMATELY 5 MPH, THE ENGINE REVVED AND THE VEHICLE ACCELERATED IN REVERSE. THE CONTACT PLACED THE GEAR IN DRIVE AND THE VEHICLE UNEXPECTEDLY ACCELERATED AGAIN, NEARLY CRASHING INTO HIS FRONT DOOR. HE TOOK THE VEHICLE TO THE DEALER AND THE…

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TL*THE CONTACT OWNS A 1999 MERCEDES BENZ ML320. WHILE BACKING OUT OF THE DRIVEWAY AT APPROXIMATELY 5 MPH, THE ENGINE REVVED AND THE VEHICLE ACCELERATED IN REVERSE. THE CONTACT PLACED THE GEAR IN DRIVE AND THE VEHICLE UNEXPECTEDLY ACCELERATED AGAIN, NEARLY CRASHING INTO HIS FRONT DOOR. HE TOOK THE VEHICLE TO THE DEALER AND THEY COULD NOT FIND ANYTHING WRONG. THE VEHICLE IS CURRENTLY AT THE DEALER. THE CURRENT AND FAILURE MILEAGES WERE 14,800.

NHTSA ODI #10200592

63,500 miles · Aug 15, 2007
Power TrainSteering

REFERENCE: VEHICLE COMPLAINT - 47046 IN SEPTEMBER 1999, WE PURCHASED A NEW MERCEDES-BENZ, ML-320. IN 2003, THE VEHICLE WAS PART OF A RECALL CONCERNING A LOWER POWER STEERING HOSE AND CLAMP AT THE RADIATOR FITTING. ON AUGUST 7, 2007, WHILE DRIVING THE VEHICLE, THE LOWER POWER STEERING HOSE BLEW OFF LOSING ALL HYDRAULIC FLUID. …

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REFERENCE: VEHICLE COMPLAINT - 47046 IN SEPTEMBER 1999, WE PURCHASED A NEW MERCEDES-BENZ, ML-320. IN 2003, THE VEHICLE WAS PART OF A RECALL CONCERNING A LOWER POWER STEERING HOSE AND CLAMP AT THE RADIATOR FITTING. ON AUGUST 7, 2007, WHILE DRIVING THE VEHICLE, THE LOWER POWER STEERING HOSE BLEW OFF LOSING ALL HYDRAULIC FLUID. WE LOST THE POWER STEERING AND HAD EXTREME DIFFICULTY STEERING THE VEHICLE. THE SAME PROBLEM HAS OCCURRED WITH A FAMILY MEMBER'S ML-320. IN ADDITION, THE TRANSMISSION HAS FROZEN FOUR TIMES IN FIRST GEAR. THE MERCEDES DEALER WAS UNABLE TO LOCATE THE PROBLEM. THE VEHICLE WAS TOWED TO THE DEALER, AND THEY REPLACED THE HOSE; HOWEVER, WE HAVE NOT RETRIEVED THE VEHICLE FROM THE DEALER BECAUSE WE ARE FEARFUL ABOUT DRIVING THE VEHICLE DUE TO THESE RECURRING PROBLEMS. *JB

NHTSA ODI #10199666

63,500 miles · Aug 13, 2007
Power TrainSteering

IN SEPTEMBER 1999, WE PURCHASED A NEW MERCEDES-BENZ, ML-320. IN 2003, THE VEHICLE WAS A PART OF A RECALL FOR A LOWER POWER STEERING HOSE AND CLAMP AT THE RADIATOR FITTING. ON AUGUST 7, 2007, WHILE DRIVING THE VEHICLE, THE LOWER POWER STEERING HOSE BLEW OFF LOOSING ALL HYDRAULIC FLUID. WE LOST THE POWER STEERING AND HAD EXTREM…

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IN SEPTEMBER 1999, WE PURCHASED A NEW MERCEDES-BENZ, ML-320. IN 2003, THE VEHICLE WAS A PART OF A RECALL FOR A LOWER POWER STEERING HOSE AND CLAMP AT THE RADIATOR FITTING. ON AUGUST 7, 2007, WHILE DRIVING THE VEHICLE, THE LOWER POWER STEERING HOSE BLEW OFF LOOSING ALL HYDRAULIC FLUID. WE LOST THE POWER STEERING AND HAD EXTREME DIFFICULTY STEERING THE VEHICLE. THE SAME PROBLEM HAS OCCURRED WITH A FAMILY MEMBER'S ML-320. IN ADDITION, THE TRANSMISSION HAS FROZEN FOUR TIMES IN FIRST GEAR. THE MERCEDES DEALER WAS UNABLE TO LOCATE THE PROBLEM. THE VEHICLE WAS TOWED TO THE DEALER AND THEY REPLACED THE HOSE; HOWEVER, WE HAVE NOT RETRIEVED THE VEHICLE FROM THE DEALER BECAUSE WE ARE FEARFUL ABOUT DRIVING THE VEHICLE DUE TO THESE RECURRING PROBLEMS. *TR

NHTSA ODI #10199413

46,000 miles · Jun 10, 2007
Service Brakes, Hydraulic

STOP AND GO TRAFFIC IN WORM WEATHER CAUSES FRONT BRAKES TO HEAT UP AND DRAG CONSTANTLY TO THE POINT OF CAUSING THE TRANSMISSION TO SHIFT DOWN AND EVENTUALLY STOP THE CAR COMPLETELY. AFTER ABOUT AN HOUR OF COOLING DOWN, IT WILL BEHAVE NORMALLY. DEALER AND A SPECIALTY SHOP CAN NOT FIND ANYTHING WRONG. THIS PROBLEM STARTED IN THE…

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STOP AND GO TRAFFIC IN WORM WEATHER CAUSES FRONT BRAKES TO HEAT UP AND DRAG CONSTANTLY TO THE POINT OF CAUSING THE TRANSMISSION TO SHIFT DOWN AND EVENTUALLY STOP THE CAR COMPLETELY. AFTER ABOUT AN HOUR OF COOLING DOWN, IT WILL BEHAVE NORMALLY. DEALER AND A SPECIALTY SHOP CAN NOT FIND ANYTHING WRONG. THIS PROBLEM STARTED IN THE SUMMER OF 2005, FOUR INCIDENTS SINCE, THE LAST ONE ON THE DATE INDICATED.

NHTSA ODI #10192858

156,000 miles · May 17, 2007
Air BagsCrashInjury

CAR STRUCK IN DRIVER'S SIDE, DAMAGING BOTH FRONT AND REAR DOOR ,AS WELL AS PARTIALLY BENDING THE POST BETWEEN THE DOORS. HOWEVER, THE SIDE AIR BAG FAILED TO DEPLOY. CAR WAS TOTALED BY THE INSURANCE COMPANY. *AK

NHTSA ODI #10191083

Mileage unknown · Apr 13, 2007
Power Train

I HAVE A MERCEDES ML 320. IT IS A 1999 MODEL WITH LESS THAN 100,000 MILES. THE TRANSMISSION SLIPS OUT OF GEAR WHEN DRIVING. SOMETIMES THE TRANSMISSION LOCKS IN GEAR..SO WHEN PULLING OUT IN AN INTERSECTION AND ONE THINKS THE TRANSMISSION WAS IN LOW FOR POWER, IT IS LOCKED IN HIGH AND THE CAR COULD NOT ACCELERATE QUICKLY ENOUGH…

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I HAVE A MERCEDES ML 320. IT IS A 1999 MODEL WITH LESS THAN 100,000 MILES. THE TRANSMISSION SLIPS OUT OF GEAR WHEN DRIVING. SOMETIMES THE TRANSMISSION LOCKS IN GEAR..SO WHEN PULLING OUT IN AN INTERSECTION AND ONE THINKS THE TRANSMISSION WAS IN LOW FOR POWER, IT IS LOCKED IN HIGH AND THE CAR COULD NOT ACCELERATE QUICKLY ENOUGH TO AVOID A POTENTIAL COLLISION WITH ONCOMING VEHICLES. ALSO, WHEN DRIVING, THE TRANSMISSION MIGHT SLIP OUT OF GEAR AT AN INOPPORTUNE TIME AS WELL. ONE HAS TO STOP THE VEHICLE AND TURN OFF THE IGNITION AND THEN RESTART WHICH RESETS THE TRANSMISSION. I HAVE SPOKEN TO MANY MECHANICS AND THEY ALL SAY THAT MERCEDES HAS KNOWN ABOUT THE PROBLEM AND REFUSES TO RECALL. I AM HAVING THE TRANSMISSION REBUILT BUT I BELIEVE THERE ARE MANY OTHER PEOPLE THAT HAVE EXPERIENCED THE PROBLEM. A RECALL SHOULD BE ORDERED ON THE 1999 THROUGH 2001 MODELS BEFORE SOMEONE DOES GET KILLED. WE HAVE EXPERIENCED THIS PROBLEM MANY TIMES IN THE PAST 2 YEARS AND WE'VE HAD THE MERCEDES DEALER TRY TO RESOLVE THE PROBLEM WITHOUT RESORTING TO A NEW TRANSMISSION. WE ALSO HAD IT TO VARIOUS INDEPENDENT MECHANICS THAT ALSO FAILED IN THEIR EFFORTS.*AK

NHTSA ODI #10187776

85,115 miles · Mar 15, 2007
Vehicle Speed Control

TL* THE CONTACT OWNS A 1999 MERCEDES BENZ ML 320. WHILE DRIVING 35 MPH ON A SECONDARY ROAD THE THROTTLE LOCKED, THERE WAS LOUD ENGINE NOISE, AND THE VEHICLE ACCELERATED TO 65 MPH. ATTEMPTING TO STOP THE VEHICLE WITH BOTH FEET ON THE BRAKE PEDAL DIDN'T WORK, THE VEHICLE CONTINUED TO ACCELERATE. THE CONTACT SHUT THE ENGINE …

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TL* THE CONTACT OWNS A 1999 MERCEDES BENZ ML 320. WHILE DRIVING 35 MPH ON A SECONDARY ROAD THE THROTTLE LOCKED, THERE WAS LOUD ENGINE NOISE, AND THE VEHICLE ACCELERATED TO 65 MPH. ATTEMPTING TO STOP THE VEHICLE WITH BOTH FEET ON THE BRAKE PEDAL DIDN'T WORK, THE VEHICLE CONTINUED TO ACCELERATE. THE CONTACT SHUT THE ENGINE OFF. THE TECHNICIAN STATED THAT THE THROTTLE CABLE BUSHING FAILED WHICH CAUSED THE BRAKES TO FAIL. A COMPLAINT WAS FILED WITH THE MANUFACTURER, AND A FACTORY REPRESENTATIVE WAS PRESENT TO DIAGNOSE THE FAILURE. THE MANUFACTURER STATED THAT THERE WERE NOTES LISTED PER THE INVESTIGATION, THEY WERE UNABLE TO SHARE THE DETAILS WITH THE CONTACT AND THAT THE CASE WAS CLOSED. THE CURRENT AND FAILURE MILEAGE WERE 85115. *AK

NHTSA ODI #10185182

129,926 miles · Jan 4, 2007
Engine And Engine CoolingSteering

TL * - THE CONTACT RECEIVED RECALL 03V121000. THE CONTACT TOOK VEHICLE TO MERCEDEZ BENZ OF PALM BEACH JANUARY 3, 2007, AND WAS DENIED ARECALL REPAIR. THE CONTACT WOULD LIKE THE REPAIRS TO BE DONE UNDER THE RECALL. THE CONTACT STATED THAT HE RECEIVED THE SAME RECALL LAST YEAR AND CHOSE NOT TO ADDRESS IT AT THAT TIME. THE VE…

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TL * - THE CONTACT RECEIVED RECALL 03V121000. THE CONTACT TOOK VEHICLE TO MERCEDEZ BENZ OF PALM BEACH JANUARY 3, 2007, AND WAS DENIED ARECALL REPAIR. THE CONTACT WOULD LIKE THE REPAIRS TO BE DONE UNDER THE RECALL. THE CONTACT STATED THAT HE RECEIVED THE SAME RECALL LAST YEAR AND CHOSE NOT TO ADDRESS IT AT THAT TIME. THE VEHICLE HAS HAD SEVERAL FAILURES , AND WAS NOW BEING DENIED REPAIR SERVICE. *AK THE COSUMER TOOK THE VEHICLE TO THE DEALER AND THEY STATEDTHERE WAS NOTHING WROG WITH THE VEHICLE. THE CONSUMER SATED WHILE DRIVING, THE THE EXHAUST BROKE IN HALF AT THE WELD. UPDATED 01/22/07. *JB

NHTSA ODI #10177747

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

2

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.

PE03006 · Power Steering Hose Assembly Leakage

Opened Feb 13, 2003 · Closed Apr 4, 2003

Status: closed (inferred from source dates) · Steering:hydraulic Power Assist:hose, Piping, And Connections; Steering:hydraulic Power Assist:power Steering Fluid

THE HOSE CLAMP USED TO SECURE THE POWER STEERING FLUID COOLING HOSE TO THE STEERING FLUID COOLER MAY NOT PROVIDE SUFFICIENT CLAMPING FORCE FOR THE CONNECTION.THE LOSS OF POWER STEERING FLUID MAY RESULT IN GRADUAL REDUCTION IN POWER STEERING ASSIST (I.E., INCREASED STEERING EFFORT) OVER TIME, WITH POTENTIAL DAMAGE TO THE POWER STEERING PUMP. THERE HAVE ALSO BEEN A FEW INCIDENTS OF HOSE SEPARATION FROM THE FITTING, THAT HAVE RESULTED IN MORE RAPID REDUCTIONS OF POWER STEERING.TESTING CONDUCTED BY MERCEDES-BENZ INDICATES THAT THE LEAKED FLUID IS NOT LIKELY TO BE EXPOSED TO HOT ENGINE COMPONENTS.THERE ARE NO KNOWN ALLEGATIONS THAT THE DEFECT CONDITION HAS CAUSED A VEHICLE FIRE. MERCEDES-BENZ WILL CONDUCT A VOLUNTARY RECALL CAMPAIGN FOR THE SUBJECT M-CLASS VEHICLES.MERCEDES-BENZ WILL INSTALL A NEW HOSE CLAMP ON THE POWER STEERING HOSE TO THE POWER STEERING COOLER OF THE SUBJECT VEHICLES.DURING CLAMP REPLACEMENT, THE POWER STEERING COOLING HOSE WILL BE INSPECTED AND REPLACED AS NECESSARY.

Additional source detail variants (2)

Steering:hydraulic Power Assist:hose, Piping, And Connections

THE HOSE CLAMP USED TO SECURE THE POWER STEERING FLUID COOLING HOSE TO THE STEERING FLUID COOLER MAY NOT PROVIDE SUFFICIENT CLAMPING FORCE FOR THE CONNECTION.THE LOSS OF POWER STEERING FLUID MAY RESULT IN GRADUAL REDUCTION IN POWER STEERING ASSIST (I.E., INCREASED STEERING EFFORT) OVER TIME, WITH POTENTIAL DAMAGE TO THE POWER STEERING PUMP. THERE HAVE ALSO BEEN A FEW INCIDENTS OF HOSE SEPARATION FROM THE FITTING, THAT HAVE RESULTED IN MORE RAPID REDUCTIONS OF POWER STEERING.TESTING CONDUCTED BY MERCEDES-BENZ INDICATES THAT THE LEAKED FLUID IS NOT LIKELY TO BE EXPOSED TO HOT ENGINE COMPONENTS.THERE ARE NO KNOWN ALLEGATIONS THAT THE DEFECT CONDITION HAS CAUSED A VEHICLE FIRE. MERCEDES-BENZ WILL CONDUCT A VOLUNTARY RECALL CAMPAIGN FOR THE SUBJECT M-CLASS VEHICLES.MERCEDES-BENZ WILL INSTALL A NEW HOSE CLAMP ON THE POWER STEERING HOSE TO THE POWER STEERING COOLER OF THE SUBJECT VEHICLES.DURING CLAMP REPLACEMENT, THE POWER STEERING COOLING HOSE WILL BE INSPECTED AND REPLACED AS NECESSARY.

Steering:hydraulic Power Assist:power Steering Fluid

THE HOSE CLAMP USED TO SECURE THE POWER STEERING FLUID COOLING HOSE TO THE STEERING FLUID COOLER MAY NOT PROVIDE SUFFICIENT CLAMPING FORCE FOR THE CONNECTION.THE LOSS OF POWER STEERING FLUID MAY RESULT IN GRADUAL REDUCTION IN POWER STEERING ASSIST (I.E., INCREASED STEERING EFFORT) OVER TIME, WITH POTENTIAL DAMAGE TO THE POWER STEERING PUMP. THERE HAVE ALSO BEEN A FEW INCIDENTS OF HOSE SEPARATION FROM THE FITTING, THAT HAVE RESULTED IN MORE RAPID REDUCTIONS OF POWER STEERING.TESTING CONDUCTED BY MERCEDES-BENZ INDICATES THAT THE LEAKED FLUID IS NOT LIKELY TO BE EXPOSED TO HOT ENGINE COMPONENTS.THERE ARE NO KNOWN ALLEGATIONS THAT THE DEFECT CONDITION HAS CAUSED A VEHICLE FIRE. MERCEDES-BENZ WILL CONDUCT A VOLUNTARY RECALL CAMPAIGN FOR THE SUBJECT M-CLASS VEHICLES.MERCEDES-BENZ WILL INSTALL A NEW HOSE CLAMP ON THE POWER STEERING HOSE TO THE POWER STEERING COOLER OF THE SUBJECT VEHICLES.DURING CLAMP REPLACEMENT, THE POWER STEERING COOLING HOSE WILL BE INSPECTED AND REPLACED AS NECESSARY.