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1999 Mercedes Benz ML430

Owner reports · Recalls · Investigations

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Mileage at the reported incident

31 reports with mileage · 13 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 18 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Power Train. Review the 8 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
  • Steering. Review the 6 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →

NHTSA owner reports · September 18, 2026 snapshot.

2 crash reports0 fire reports2 injury reports

Engine And Engine Cooling complaints

18 reports
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65,000 miles · Dec 31, 2013
Electrical SystemEngine And Engine Cooling

DECEMBER 11, 2013 I WAS DRIVING HOME FROM WORK MY BENZ QUIT ON ME IN THE ROAD WOULD NOT START BACK (MY HOME IS WITHIN 2 MILES OF MY WORK) THE DAY BEFORE IT HAD QUIT AS I WAS MAKING A TURN BUT RESTARTED A COUPLE OF DAYS PRIOR I HAD THE CAR WARMING AND IT SHUT OFF WHILE WARMING UP BUT RESTARTED. THERE WAS NO LIGHTS ON THE INSTRUME…

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DECEMBER 11, 2013 I WAS DRIVING HOME FROM WORK MY BENZ QUIT ON ME IN THE ROAD WOULD NOT START BACK (MY HOME IS WITHIN 2 MILES OF MY WORK) THE DAY BEFORE IT HAD QUIT AS I WAS MAKING A TURN BUT RESTARTED A COUPLE OF DAYS PRIOR I HAD THE CAR WARMING AND IT SHUT OFF WHILE WARMING UP BUT RESTARTED. THERE WAS NO LIGHTS ON THE INSTRUMENT DASH PANEL LIT OR STAYING LIT. AFTER SOME INTERNET INVESTIGATING I ASSUME IT WAS THE CRANKSHAFT POSITION SENSOR AS IT HAD ALL THE SIGNS THAT OTHERS HAVE HAD I PURCHASED ONE FOR THE REPAIR SHOP TO INSTALL. THEY HAVE INSTALLED IT BUT BELIEVE THERE IS A PROBLEM WITH THE CRANKSHAFT SO I AM NOT CURRENTLY DRIVING IT. I AM AFRAID TO DRIVE IT WITH IT QUITTING WITHOUT ANY TYPE OF WARNING. MY BENZ HAS LESS THAN 65K I DON'T HAVE THE CURRENT MILEAGE WITH ME AT THIS TIME BUT IF IT IS NEEDED PLEASE LET ME KNOW. *TR

NHTSA ODI #10557938

98,000 miles · Sep 22, 2010
Engine And Engine Cooling

TL* THE OWNS A 1999 MERCEDES-BENZ ML 430. THE CONTACT STATED WHILE DRIVING 25 MPH THE CATALYTIC CONVERTER STARTING MAKING A NOISE AND LEAKING. THE CONTACT TOOK THE VEHICLE TO A LOCAL MECHANIC AND THE MECHANIC NOTICE THE WELDING WAS CRACKING. THE MECHANIC PULLED UP A RECALL AND SUGGESTED THE CONTACT TAKE THE VEHICLE TO THE DEAL…

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TL* THE OWNS A 1999 MERCEDES-BENZ ML 430. THE CONTACT STATED WHILE DRIVING 25 MPH THE CATALYTIC CONVERTER STARTING MAKING A NOISE AND LEAKING. THE CONTACT TOOK THE VEHICLE TO A LOCAL MECHANIC AND THE MECHANIC NOTICE THE WELDING WAS CRACKING. THE MECHANIC PULLED UP A RECALL AND SUGGESTED THE CONTACT TAKE THE VEHICLE TO THE DEALER. THE CONTACT TOOK THE VEHICLE TO THE DEALER FOR THE RECALL REMEDY REPAIR AND THE DEALER STATED DUE TO THE VIN NUMBER, THE VEHICLE IS NOT INCLUDED IN THE RECALL. THE DEALER SUGGESTED TO THE CONTACT THAT HE CALL MANUFACTURER. THE CONTACT CALLED THE MANUFACTURER AND THEY INFORMED THE CONTACT THEIR IS NOTHING THEY CAN DO AND THE RECALL CAMPAIGN IS CLOSED. THE CONTACT STATED THE MANUFACTURER SHOULD BE RESPONSIBLE FOR THE RECALL. THE FAILURE MILEAGE WAS 98,000.

NHTSA ODI #10357002

131,700 miles · Jul 28, 2010
Engine And Engine Cooling

TL* THE CONTACT OWNS A 1999 MERCEDES BENZ ML430. WHILE DRIVING AT 25 MPH, THE CONTACT HEARD A LOUD, UNUSUAL POP. THE CONTACT STATED THE VEHICLE SOUNDED SIMILAR TO A LOUD MOTORCYCLE. THE VEHICLE WAS TAKEN TO THE DEALER WHERE THE CONTACT WAS ADVISED THAT THE TWO FRONT CATALYTIC CONVERTERS WOULD NEED TO BE REPLACED. THERE WAS NOT…

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TL* THE CONTACT OWNS A 1999 MERCEDES BENZ ML430. WHILE DRIVING AT 25 MPH, THE CONTACT HEARD A LOUD, UNUSUAL POP. THE CONTACT STATED THE VEHICLE SOUNDED SIMILAR TO A LOUD MOTORCYCLE. THE VEHICLE WAS TAKEN TO THE DEALER WHERE THE CONTACT WAS ADVISED THAT THE TWO FRONT CATALYTIC CONVERTERS WOULD NEED TO BE REPLACED. THERE WAS NOT A RECALL FOR THE FAILURE. THE VEHICLE WAS NOT REPAIRED. THE FAILURE MILEAGE WAS 131,700 AND THE CURRENT MILEAGE WAS 132,000.

NHTSA ODI #10345951

82,663 miles · Sep 24, 2004
Engine And Engine Cooling

CRANKSHAFT HARMONIC BALANCER FAILURE! (1999 MERCEDES BENZ ML430)... MILEAGE: 82000 REF: NHTSA ACTION # 03058..HE PULLEY FAILURE JUST OCCURRED WHILE DRIVING DOWN I85 IN ATL. UPON HEARING A KNOCKING NOISE AND SMELLING WHAT SEEMED LIKE RUBBER BURNING, I IMMEDIATELY STOPPED THE ENGINE. IT TOOK NO TIME TO FIND THE SOURCE OF THE SMELL…

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CRANKSHAFT HARMONIC BALANCER FAILURE! (1999 MERCEDES BENZ ML430)... MILEAGE: 82000 REF: NHTSA ACTION # 03058..HE PULLEY FAILURE JUST OCCURRED WHILE DRIVING DOWN I85 IN ATL. UPON HEARING A KNOCKING NOISE AND SMELLING WHAT SEEMED LIKE RUBBER BURNING, I IMMEDIATELY STOPPED THE ENGINE. IT TOOK NO TIME TO FIND THE SOURCE OF THE SMELL, IT WAS THE V-BELT (NO LONGER CENTERED ON ALL PULLEYS) RUBBING AGAINST THE ENGINE. BEING REASONABLY MECHANIC SAVVY, I KNEW THIS WAS A LITTLE MORE SERIOUS THAN JUST A WATER PUMP OUTAGE AND PROCEEDED CALLED A TOW TRUCK. THE VEHICLE WAS TOWED TO MY LOCAL MB DEALERSHIP (MB OF S.ATL) AT A COST OF $52.00& APROX DROP TIME: 8:00 PM. THE FOLLOWING MORNING I CONTACTED THE SERVICE DEPARTMENT TO FURTHER EXPLAIN MY SITUATION AND WAS ADVISED THAT THIS IS A KNOWN AND VERY COMMON ISSUE WITH THE V6 AND V8 ENGINES OF WHICH MINE IS THE LATTER (113942). HAVING NO KNOWLEDGE OF THE MULTITUDE OF CUSTOMER COMPLAINTS AND LAW SUITES, I WAS FLOORED WHEN THE QUOTE OF APPROXIMATELY $3500.00 WAS DROPPED IN MY LAP. THE DEALER HAS AGREED TO COMP THE PARTS.. APROX COST: $1300.. THE LABOR (14.85 HRS TOTALED $1510.00) I GET TO EAT! LAW SUITE TO FOLLOW IN AN ATTEMPT TO RECOVER MY OUT OF POCKET COST! WHY IS THIS NOT A RECALL ITEM!!!!!*AK

NHTSA ODI #10093140

72,000 miles · Sep 5, 2004
Engine And Engine Cooling

I'M AN OWNER OF A 1999 MERCEDES BENZ ML430 WHICH IN MY BELIEF HAS A DEFECTIVE PART NAMED A HARMONIC BALANCER OR A CRANK SHAFT PULLEY. THE REASON IM FILING MY COMPLAINT IS BECAUSE I WAS TOLD BY A MERCEDES BENZ SERVICE REP(CHRIS) OF TRI-STAR MERCEDES BENZ IN THE ST LOUIS MO,AREA THAT HE HAD NO KNOWLEDGE OF A MALFUNCTION OR A DEFE…

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I'M AN OWNER OF A 1999 MERCEDES BENZ ML430 WHICH IN MY BELIEF HAS A DEFECTIVE PART NAMED A HARMONIC BALANCER OR A CRANK SHAFT PULLEY. THE REASON IM FILING MY COMPLAINT IS BECAUSE I WAS TOLD BY A MERCEDES BENZ SERVICE REP(CHRIS) OF TRI-STAR MERCEDES BENZ IN THE ST LOUIS MO,AREA THAT HE HAD NO KNOWLEDGE OF A MALFUNCTION OR A DEFECTIVE PART CALLED THE HARMONIC BALANCER THE INQUIRY WAS MADE AS I BROUGHT MY VEHICLE TO THE SAID ESTABLISHMENT AFTER HAVING A PROBLEM WITH A LOUD NOISE LIKE GRINDING IN THE ENGINE DEPARTMENT THE BATTERY LIGHT CAME ON THE ENGINE STARTED TO DIE OUT THE POWER STEERING BEGAN TO FAIL JUST THINK IF MY WIFE HAD BEEN DRIVING THE CAR SHE COULD HAVE CAUSED SERIOUS DAMAGE TO OTHERS AND HERSELF BUT GOD.... ON WEDNESDAY AUG 1,04 I HAD THE CAR TOWED TO TRI-STAR MERCEDES BENZ ON THE FOLLOWING DAY I RECEIVED A CALL FROM SERVICE REP CHRIS AND I TOLD HIM WHAT HAPPENED, HE SAID HE WOULD HAVE HIS TECH'S LOOK AT IT HE CALLED BACK ON THE SAME DAY AND STATED WHAT THE PROBLEM WAS I ASKED HIM DOES THIS HAPPEN OFTEN TO THE ML HE STATED NO. I WAS THEN QUOTED A PRICE OF 1700 DOLLARS TO FIX THE PROBLEM IF THE OIL PANS WERE DAMAGED AND 1450 IF IT WAS NOT. AFTER RECEIVING MY CAR BACK I AM HAVING PROBLEMS OF SHAKING IN MY STEERING WHEEL LIKE THERE'S SOMETHING WRONG WITH MY TIRES BUT THERE IS NOT. I BELIEVE ITS GOT SOMETHING TO DO WITH THE COSTLY REPAIRS OF THE HARMONIC BALANCER. A COUPLE OF WEB SITES WERE FOUND WERE I DISCOVERED ACCORDING TO OTHER MB OWNERS WERE HAVING THE SAME PROBLEM I THINK THAT MB IS TRYING TO COVER UP THAT THERE IS A POTENTIAL LIFE THREATENING SITUATION ON THERE HANDS AND WHICH HAVE COST MILLIONS OF DOLLARS TO THE CONSUMER SUCH AS MYSELF. THOSE THAT HAVE NO PROBLEMS WITH THERE MB SHOULD BE WARNED OF THE POTENTIAL DANGER AND MB SHOULD OWN UP TO THERE RESPONSIBILITY AND RECALL THERE CARS AND SUV AND REFUND MONEY TO THOSE WHO HAVE HAD COSTLY REPAIRS DONE BECAUSE OF THIS SAID COSTLY DEFECT. WHO KNOWS HOW MANY ACCIDENTS HAVE HAPPENED CAUSING LIVES TO PERISH. *JB

NHTSA ODI #10090485

Mileage unknown · Feb 3, 2004
Engine And Engine Cooling

HARMONIC BALANCER/VIBRATION DAMPNER ON ML430 MERCEDES-BENZ DEFECTIVE.*AK

NHTSA ODI #10056431

78,000 miles · Jan 17, 2004
Engine And Engine CoolingSteeringUnknown Or Other

MERCEDES BENZ 1999 ML 430. HARMONIC BALANCER FAILED. DRIVING 65+ ON THE MASS. PIKE, THE POWER STEERING FAILED, AND THEN THE ENGINE BEGIN TO OVERHEAT. THE VEHICLE HAD TO BE WRESTLED FROM THE LEFT LANE, ACROSS 3 VERY BUSY LANES OF TRAFFIC TO THE SIDE OF THE HIGHWAY. THE STATE POLICE WERE CALLED AND THE VEHICLE WAS TOWED. I LA…

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MERCEDES BENZ 1999 ML 430. HARMONIC BALANCER FAILED. DRIVING 65+ ON THE MASS. PIKE, THE POWER STEERING FAILED, AND THEN THE ENGINE BEGIN TO OVERHEAT. THE VEHICLE HAD TO BE WRESTLED FROM THE LEFT LANE, ACROSS 3 VERY BUSY LANES OF TRAFFIC TO THE SIDE OF THE HIGHWAY. THE STATE POLICE WERE CALLED AND THE VEHICLE WAS TOWED. I LATER LEARNED THAT THE CRANK SHAFT PULLEY HAD BROKEN APART AND CAUSED A CHAIN REACTION OF FAILURES ULTIMATELY LEADING TO THE ABOVE. * CB

NHTSA ODI #10054362

Mileage unknown · Nov 21, 2003
Engine And Engine CoolingFuel System, Other

MERCEDES BENZ (MB) HAS A DEFECTIVE HARMONIC BALANCER WHICH THEY WILL NOT PROVIDE REPLACEMENT FOR WILLINGLY. THEIR OFFICIAL LINE IS THAT THEY "HAVE NO POLICY" WITH REGARD TO THIS. THE PART IN QUESTION IS ON "NATIONAL BACKORDER" I WAS TOLD BY 2 DIFFERENT SOURCES. MB WAS CONDESCENDING & RUDE WHEN I INQUIRED ABOUT THIS. THEIR DEA…

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MERCEDES BENZ (MB) HAS A DEFECTIVE HARMONIC BALANCER WHICH THEY WILL NOT PROVIDE REPLACEMENT FOR WILLINGLY. THEIR OFFICIAL LINE IS THAT THEY "HAVE NO POLICY" WITH REGARD TO THIS. THE PART IN QUESTION IS ON "NATIONAL BACKORDER" I WAS TOLD BY 2 DIFFERENT SOURCES. MB WAS CONDESCENDING & RUDE WHEN I INQUIRED ABOUT THIS. THEIR DEALERSHIPS PROVIDE NO HELP. FAILURE OF THIS PART CAN BE DANGEROUS. I HAVE FILED REPORTS WITH MY STATE ATTORNEY GENERAL & THE BBB. A RECALL IS NECESSARY IMMEDIATELY!! P.S. (THE FUEL GAGE DOES NOT READ FULL EVER!) *LA

NHTSA ODI #10047306

54,000 miles · Nov 19, 2003
Engine And Engine Cooling

THE HARMONIC BALANCER ON ALL MERCEDES BENZ V6 AND V8 ENGINES BETWEEN 1995 AND 1999 IS DEFECTIVE. MB KNOWS ABOUT THIS PROBLEM AND REFUSES TO ACKNOWLEDGE THE PROBLEM. WHEN THE $100 DEFECTIVE PART FAILS AROUND 50K MILES IT CAUSES $2K-3K IN DAMAGE. PLEASE SEE THE SITE MERCEDESSHOP.COM TO VIEW THE NUMBER OF COMPLAINTS. I HAVE SPO…

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THE HARMONIC BALANCER ON ALL MERCEDES BENZ V6 AND V8 ENGINES BETWEEN 1995 AND 1999 IS DEFECTIVE. MB KNOWS ABOUT THIS PROBLEM AND REFUSES TO ACKNOWLEDGE THE PROBLEM. WHEN THE $100 DEFECTIVE PART FAILS AROUND 50K MILES IT CAUSES $2K-3K IN DAMAGE. PLEASE SEE THE SITE MERCEDESSHOP.COM TO VIEW THE NUMBER OF COMPLAINTS. I HAVE SPOKEN TO MBUSA CUSTOMER SERVICE, THE M-B AREA MANAGER, RON ST.PIERRE, AND DREHER-HOLLOWAY SERVICE MANAGER, MIKE BELLAIGERON. ALL REFUSE TO REPLACE THESE DEFECTIVE ITEMS. M-B RE-DESIGNED THE PART IN 2001 AND ISSUED A TECHNICAL BULLETIN IN DEC 2001 DIRECTING SERVICE TECHCNICANS TO REPLACE THE PART WITH A NEW STOCK NUMBER. THEY KNOW THE PROBLEM EXISTS BUT WAIT FOR THE FAUILURES BECUSE THEY GET MORE REVENUE FROM REPAIRING THE DAMAGE CAUSED BY THE FAILURE. *AK

NHTSA ODI #10047190

52,231 miles · Nov 7, 2003
Engine And Engine Cooling

THE VEHICLE STALLS AT ANY SPEED WITHOUT WARNING. CONSUMER CONTACTED DEALER ON SIX SEPARATE OCCASIONS, BUT THE PROBLEM STILL OCCURS. *AK

NHTSA ODI #10046528

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

EA08009 · Brake Line Chafe

Opened Apr 28, 2008 · Closed Dec 16, 2009

Status: closed (inferred from source dates) · Fuel System, Gasoline:delivery:hoses, Lines/piping, And Fittings; Service Brakes, Hydraulic:foundation Components:hoses, Lines/piping, And Fittings

ANALYSIS OF COMPLAINTS TO ODI AND MERCEDES AND WARRANTY CLAIM DATA SUBMITTED BY MERCEDES INDICATES THAT THE ALLEGED DEFECT HAS OCCURRED AT A LOW RATE (36.5 COMPLAINTS PER 100,000 VEHICLES AND 0.29 PERCENT WARRANTY CLAIM RATE), WITH NO DISCERNABLE DEFECT TREND INDICATING THAT THE RATE OF CHAFING RELATED BRAKE LINE FAILURES IS INCREASING.THERE HAVE BEEN NO NEW COMPLAINTS SINCE JANUARY 2009.WHEN THE ANALYSIS IS LIMITED TO INCIDENTS OF BRAKE LINE LEAKAGE THAT RESULTED IN ALLEGATIONS OF REDUCED BRAKE EFFECTIVENESS, THE RATE DROPS EVEN FURTHER (22.3 COMPLAINTS PER 100,000 VEHICLES AND 0.04 PERCENT WARRANTY CLAIM RATE). MERCEDES PROVIDED DATA SHOWING THAT IN THE RARE INSTANCES WHEN CHAFING DID PROGRESS TO BRAKE LINE LEAKAGE THE DRIVER WOULD BE IMMEDIATELY ALERTED TO A PROBLEM BY ILLUMINATION OF THE BRIGHT YELLOW ESP/BAS WARNING LAMP AND CHANGES IN BRAKE PEDAL FEEL.CONTINUED OPERATION WITH A LEAKING BRAKE LINE WOULD RESULT IN ILLUMINATION OF THE BRIGHT RED BRAKE WARNING LAMP AND AN AUDIBLE CHIME DUE TO LOW MASTER CYLINDER RESERVOIR LEVEL. CONTINUED OPERATION WITH THE BRAKE WARNING LAMP ILLUMINATED WOULD ULTIMATELY DRAIN THE RESERVOIR FOR THE AFFECTED CIRCUIT, RESULTING IN LOSS OF THE CIRCUIT AND AN APPROXIMATELY 80% INCREASE IN STOPPING DISTANCES. SURVEYS CONDUCTED BY ODI AND VRTC INDICATE THAT ROUTING ANOMALIES MAY BE MORE COMMON THAN THE COMPLAINT AND WARRANTY DATA SUGGEST FOR THE SUBJECT LINE BUNDLE, WITH LINE CONTACT OR OTHER ROUTING ANOMALY NOTED IN 13 OF 51 VEHICLES SURVEYED BY ODI AND VRTC (25.5%).WHILE EVIDENCE OF CONTACT BETWEEN THE FUEL LINE AND SUBJECT BRAKE IN A PARTICULAR VEHICLE IS NOT NECESSARILY PREDICTIVE OF EVENTUAL LINE FAILURE/LEAKAGE, SIGNIFICANT CHAFING WEAR WAS NOTED IN TWO SURVEY VEHICLES (3.9%).TO ADDRESS CONCERNS WITH LINE ROUTING AND ENSURE THAT LINES WITH EVIDENT CHAFING DO NOT PROGRESS TO A LEAK CONDITION, MERCEDES WILL CONDUCT AN OWNER NOTIFICATION PROGRAM INSTRUCTING OWNERS TO BRING THE VEHICLES TO A DEALER FOR A FREE INSPECTION AND REPAIR.LINES THAT DO NOT HAVE A SPACER (RUBBER GROMMET OR OMEGA-CLIP) BETWEEN THE SUBJECT FUEL AND BRAKE LINES WILL HAVE AN OMEGA-CLIP SPACER INSTALLED TO ENSURE ADEQUATE CLEARANCE BETWEEN THE LINES.BRAKE LINES WITH CHAFE MARKS WILL BE REPLACED. ACCORDINGLY, THIS INVESTIGATION HAS BEEN CLOSED. THE CLOSING OF THIS INVESTIGATION DOES NOT CONSTITUTE A FINDING BY NHTSA THAT A SAFETY-RELATED DEFECT DOES NOT EXIST. THE AGENCY WILL CONTINUE TO MONITOR COMPLAINTS AND OTHER INFORMATION RELATING TO THE ALLEGED DEFECT IN THE SUBJECT VEHICLES AND TAKE FURTHER ACTION IN THE FUTURE IF WARRANTED. FOR ADDITIONAL INFORMATION REGARDING THIS ENGINEERING ANALYSIS REFER TO THE EA08-009 CLOSING REPORT.

Additional source detail variants (2)

Fuel System, Gasoline:delivery:hoses, Lines/piping, And Fittings

ANALYSIS OF COMPLAINTS TO ODI AND MERCEDES AND WARRANTY CLAIM DATA SUBMITTED BY MERCEDES INDICATES THAT THE ALLEGED DEFECT HAS OCCURRED AT A LOW RATE (36.5 COMPLAINTS PER 100,000 VEHICLES AND 0.29 PERCENT WARRANTY CLAIM RATE), WITH NO DISCERNABLE DEFECT TREND INDICATING THAT THE RATE OF CHAFING RELATED BRAKE LINE FAILURES IS INCREASING.THERE HAVE BEEN NO NEW COMPLAINTS SINCE JANUARY 2009.WHEN THE ANALYSIS IS LIMITED TO INCIDENTS OF BRAKE LINE LEAKAGE THAT RESULTED IN ALLEGATIONS OF REDUCED BRAKE EFFECTIVENESS, THE RATE DROPS EVEN FURTHER (22.3 COMPLAINTS PER 100,000 VEHICLES AND 0.04 PERCENT WARRANTY CLAIM RATE). MERCEDES PROVIDED DATA SHOWING THAT IN THE RARE INSTANCES WHEN CHAFING DID PROGRESS TO BRAKE LINE LEAKAGE THE DRIVER WOULD BE IMMEDIATELY ALERTED TO A PROBLEM BY ILLUMINATION OF THE BRIGHT YELLOW ESP/BAS WARNING LAMP AND CHANGES IN BRAKE PEDAL FEEL.CONTINUED OPERATION WITH A LEAKING BRAKE LINE WOULD RESULT IN ILLUMINATION OF THE BRIGHT RED BRAKE WARNING LAMP AND AN AUDIBLE CHIME DUE TO LOW MASTER CYLINDER RESERVOIR LEVEL. CONTINUED OPERATION WITH THE BRAKE WARNING LAMP ILLUMINATED WOULD ULTIMATELY DRAIN THE RESERVOIR FOR THE AFFECTED CIRCUIT, RESULTING IN LOSS OF THE CIRCUIT AND AN APPROXIMATELY 80% INCREASE IN STOPPING DISTANCES. SURVEYS CONDUCTED BY ODI AND VRTC INDICATE THAT ROUTING ANOMALIES MAY BE MORE COMMON THAN THE COMPLAINT AND WARRANTY DATA SUGGEST FOR THE SUBJECT LINE BUNDLE, WITH LINE CONTACT OR OTHER ROUTING ANOMALY NOTED IN 13 OF 51 VEHICLES SURVEYED BY ODI AND VRTC (25.5%).WHILE EVIDENCE OF CONTACT BETWEEN THE FUEL LINE AND SUBJECT BRAKE IN A PARTICULAR VEHICLE IS NOT NECESSARILY PREDICTIVE OF EVENTUAL LINE FAILURE/LEAKAGE, SIGNIFICANT CHAFING WEAR WAS NOTED IN TWO SURVEY VEHICLES (3.9%).TO ADDRESS CONCERNS WITH LINE ROUTING AND ENSURE THAT LINES WITH EVIDENT CHAFING DO NOT PROGRESS TO A LEAK CONDITION, MERCEDES WILL CONDUCT AN OWNER NOTIFICATION PROGRAM INSTRUCTING OWNERS TO BRING THE VEHICLES TO A DEALER FOR A FREE INSPECTION AND REPAIR.LINES THAT DO NOT HAVE A SPACER (RUBBER GROMMET OR OMEGA-CLIP) BETWEEN THE SUBJECT FUEL AND BRAKE LINES WILL HAVE AN OMEGA-CLIP SPACER INSTALLED TO ENSURE ADEQUATE CLEARANCE BETWEEN THE LINES.BRAKE LINES WITH CHAFE MARKS WILL BE REPLACED. ACCORDINGLY, THIS INVESTIGATION HAS BEEN CLOSED. THE CLOSING OF THIS INVESTIGATION DOES NOT CONSTITUTE A FINDING BY NHTSA THAT A SAFETY-RELATED DEFECT DOES NOT EXIST. THE AGENCY WILL CONTINUE TO MONITOR COMPLAINTS AND OTHER INFORMATION RELATING TO THE ALLEGED DEFECT IN THE SUBJECT VEHICLES AND TAKE FURTHER ACTION IN THE FUTURE IF WARRANTED. FOR ADDITIONAL INFORMATION REGARDING THIS ENGINEERING ANALYSIS REFER TO THE EA08-009 CLOSING REPORT.

Service Brakes, Hydraulic:foundation Components:hoses, Lines/piping, And Fittings

ANALYSIS OF COMPLAINTS TO ODI AND MERCEDES AND WARRANTY CLAIM DATA SUBMITTED BY MERCEDES INDICATES THAT THE ALLEGED DEFECT HAS OCCURRED AT A LOW RATE (36.5 COMPLAINTS PER 100,000 VEHICLES AND 0.29 PERCENT WARRANTY CLAIM RATE), WITH NO DISCERNABLE DEFECT TREND INDICATING THAT THE RATE OF CHAFING RELATED BRAKE LINE FAILURES IS INCREASING.THERE HAVE BEEN NO NEW COMPLAINTS SINCE JANUARY 2009.WHEN THE ANALYSIS IS LIMITED TO INCIDENTS OF BRAKE LINE LEAKAGE THAT RESULTED IN ALLEGATIONS OF REDUCED BRAKE EFFECTIVENESS, THE RATE DROPS EVEN FURTHER (22.3 COMPLAINTS PER 100,000 VEHICLES AND 0.04 PERCENT WARRANTY CLAIM RATE). MERCEDES PROVIDED DATA SHOWING THAT IN THE RARE INSTANCES WHEN CHAFING DID PROGRESS TO BRAKE LINE LEAKAGE THE DRIVER WOULD BE IMMEDIATELY ALERTED TO A PROBLEM BY ILLUMINATION OF THE BRIGHT YELLOW ESP/BAS WARNING LAMP AND CHANGES IN BRAKE PEDAL FEEL.CONTINUED OPERATION WITH A LEAKING BRAKE LINE WOULD RESULT IN ILLUMINATION OF THE BRIGHT RED BRAKE WARNING LAMP AND AN AUDIBLE CHIME DUE TO LOW MASTER CYLINDER RESERVOIR LEVEL. CONTINUED OPERATION WITH THE BRAKE WARNING LAMP ILLUMINATED WOULD ULTIMATELY DRAIN THE RESERVOIR FOR THE AFFECTED CIRCUIT, RESULTING IN LOSS OF THE CIRCUIT AND AN APPROXIMATELY 80% INCREASE IN STOPPING DISTANCES. SURVEYS CONDUCTED BY ODI AND VRTC INDICATE THAT ROUTING ANOMALIES MAY BE MORE COMMON THAN THE COMPLAINT AND WARRANTY DATA SUGGEST FOR THE SUBJECT LINE BUNDLE, WITH LINE CONTACT OR OTHER ROUTING ANOMALY NOTED IN 13 OF 51 VEHICLES SURVEYED BY ODI AND VRTC (25.5%).WHILE EVIDENCE OF CONTACT BETWEEN THE FUEL LINE AND SUBJECT BRAKE IN A PARTICULAR VEHICLE IS NOT NECESSARILY PREDICTIVE OF EVENTUAL LINE FAILURE/LEAKAGE, SIGNIFICANT CHAFING WEAR WAS NOTED IN TWO SURVEY VEHICLES (3.9%).TO ADDRESS CONCERNS WITH LINE ROUTING AND ENSURE THAT LINES WITH EVIDENT CHAFING DO NOT PROGRESS TO A LEAK CONDITION, MERCEDES WILL CONDUCT AN OWNER NOTIFICATION PROGRAM INSTRUCTING OWNERS TO BRING THE VEHICLES TO A DEALER FOR A FREE INSPECTION AND REPAIR.LINES THAT DO NOT HAVE A SPACER (RUBBER GROMMET OR OMEGA-CLIP) BETWEEN THE SUBJECT FUEL AND BRAKE LINES WILL HAVE AN OMEGA-CLIP SPACER INSTALLED TO ENSURE ADEQUATE CLEARANCE BETWEEN THE LINES.BRAKE LINES WITH CHAFE MARKS WILL BE REPLACED. ACCORDINGLY, THIS INVESTIGATION HAS BEEN CLOSED. THE CLOSING OF THIS INVESTIGATION DOES NOT CONSTITUTE A FINDING BY NHTSA THAT A SAFETY-RELATED DEFECT DOES NOT EXIST. THE AGENCY WILL CONTINUE TO MONITOR COMPLAINTS AND OTHER INFORMATION RELATING TO THE ALLEGED DEFECT IN THE SUBJECT VEHICLES AND TAKE FURTHER ACTION IN THE FUTURE IF WARRANTED. FOR ADDITIONAL INFORMATION REGARDING THIS ENGINEERING ANALYSIS REFER TO THE EA08-009 CLOSING REPORT.

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.