Tap a category to read its complaints. One report may name several components.
When problems were reported
Mileage at the reported incident
Limited mileage data: 5 of 6 reports include usable mileage. There isn’t enough coverage to show a useful chart.
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.
Electrical System. 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.
0 crash reports0 fire reports0 injury reports
What owners actually said
6 reports
186,000 miles · Jun 5, 2008
Electrical System
I WAS DRIVING DOWN THE ROAD WHILE MY CAR (1994 MERCEDES S500)STARTED TO SMOKE A GREAT DEAL. WHEN I WAS ABLE TO PULL OFF I WAS STRANDED FOR 6 HOURS UNTIL I COULD GET A TOW TRUCK. AFTER SPENDING $2000.00 DOLLARS TO GET FIXED IT WAS BROUGHT TO MY ATTENTION THAT THE PROBLEM THAT CAUSED ALL OF THIS TO HAPPEN WAS AN ENGINE WIRING HAR…
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I WAS DRIVING DOWN THE ROAD WHILE MY CAR (1994 MERCEDES S500)STARTED TO SMOKE A GREAT DEAL. WHEN I WAS ABLE TO PULL OFF I WAS STRANDED FOR 6 HOURS UNTIL I COULD GET A TOW TRUCK. AFTER SPENDING $2000.00 DOLLARS TO GET FIXED IT WAS BROUGHT TO MY ATTENTION THAT THE PROBLEM THAT CAUSED ALL OF THIS TO HAPPEN WAS AN ENGINE WIRING HARNESS AND I WOULD NEED ANOTHER. I WAS ABLE TO DRIVE FROM SHOP BUT CAR CUT OFF IN TRAFFIC. I IMMEDIATELY TOOK IT HOME. I RESEARCHED THE ISSUE AND LOOK AT THIS: HTTP://USERS.ADELPHIA.NET/~INFOAGE1/COMPLAINTS_NHTSA_MERCEDES_WIRING_HARNESS_FAILURES_1991_1996.HTML I AM OUTRAGED! THIS IS CAUSING MANY PEOPLE AND CHILDREN TO BE PUT IN LIFE OR DEATH SITUATIONS WITHOUT ANY ANSWER OR HELP FROM YOU ALL. DO NOT WAIT TILL SOMEBODY DIES BECAUSE IT WILL HAPPEN. YOU HAVE THE EVIDENCE YOU NEED! I TRIED CONTACTING MERCEDES AND THEY WERE AS WORTHLESS AS THEIR FAULTY PRODUCT. *TR
NHTSA ODI #10230080
140,000 miles · Oct 24, 2007
Electrical System
ENGINE WIRING HARNESS COVERING MATERIAL ON BOTH MY 1994 MB E500'S HAS DETERIORATED CAUSING SHORTS BETWEEN WIRES, ENGINE MISS-FIRING, HABITUAL "CHECK ENGINE" LIGHT BEING ON, ETC. HAVE DISCUSSED ISSUE WITH KNOWLEDGEABLE MB MECHANICS AND THIS IS A KNOWN PROBLEM ON 1991 --> 1996 MB'S. OBVIOUSLY THE WIRE COVERING MATERIAL IS DEFECTIV…
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ENGINE WIRING HARNESS COVERING MATERIAL ON BOTH MY 1994 MB E500'S HAS DETERIORATED CAUSING SHORTS BETWEEN WIRES, ENGINE MISS-FIRING, HABITUAL "CHECK ENGINE" LIGHT BEING ON, ETC. HAVE DISCUSSED ISSUE WITH KNOWLEDGEABLE MB MECHANICS AND THIS IS A KNOWN PROBLEM ON 1991 --> 1996 MB'S. OBVIOUSLY THE WIRE COVERING MATERIAL IS DEFECTIVE AS THIS HARNESS SHOULD LAST THE LIFETIME OF THE CAR. MB AT THE VERY LEAST SHOULD PROVIDE REPLACEMENT HARNESSES AT NO COST TO THE CONSUMERS THAT PURCHASES THEIR AUTOMOBILES. FOR MB TO RESPOND THAT THIS CONDITION IS NORMAL WEAR & TEAR IS NOT FACTUAL! *TR
NHTSA ODI #10206785
Mileage unknown · Apr 23, 2007
Electrical System
ENGINE WIRING HARNESS FAILURE. *TR
NHTSA ODI #10188610
130,000 miles · Oct 6, 2005
Electrical System
CONSUMER COMPLAINT: ODI CASE NUMBER: 10137365 COMPONENT: ELECTRICAL SYSTEM:WIRING:FRONT UNDERHOOD DETAILS: INSULATION ON ELECTRICAL WIRING CRUMBLES TO DUST, RESULTING IN SHORTS, DAMAGED ELECTRONICS, ENGINE STALLING, ABS FAILURE, ETC. IT APPEARS MBZ USED DEFECTIVE INSULATION ON THE ELECTRICAL WIRES IN THE ENGINE COMPAR…
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CONSUMER COMPLAINT: ODI CASE NUMBER: 10137365 COMPONENT: ELECTRICAL SYSTEM:WIRING:FRONT UNDERHOOD DETAILS: INSULATION ON ELECTRICAL WIRING CRUMBLES TO DUST, RESULTING IN SHORTS, DAMAGED ELECTRONICS, ENGINE STALLING, ABS FAILURE, ETC. IT APPEARS MBZ USED DEFECTIVE INSULATION ON THE ELECTRICAL WIRES IN THE ENGINE COMPARTMENT WIRING HARNESSES. IN ALL LOCATIONS THAT ARE EXPOSED TO HIGHER THAN AMBIENT TEMPERATURE THE INSULATION CRUMBLES TO DUST. . DEALER SAYS 'ITS A VERY COMMON PROBLEM WITH 92-95 MODEL YEARS'. REPLACEMENT HARNESSES COST OVER $3000 (2 RQD) AND REPLACEMENT COMPONENTS WITH INTEGRAL DEFECTIVE WIRING COST OVER $8000 (NOT INCLUDING ANY COMPUTER BOXES THAT GET DAMAGED BY SHORTS. *NM
NHTSA ODI #10138922
163,000 miles · Jan 13, 2004
Electrical System
WHILE DRIVING 35 MPH, THE VEHICLE ASR SENSOR LIGHT COMES ON. AS A RESULT THE VEHICLE WOULD STALL. THE CAUSE HAS YET TO BE DETERMINED. PLEASE PROVIDE ADDITIONAL INFORMATION. *PH DEALER WOULDN'T HELP. *PH
NHTSA ODI #10050025
31,000 miles · Nov 19, 2003
Electrical SystemUnknown Or Other
COMPLAINT REGARDING INTERNATIONAL FRAUD AND HARASSMENT PRACTICES INVOLVING MERCEDES BENZ.*MR THE CONSUMER STATED THE VEHICLE HAD JUST OVER 31,000 MILES ON THE VEHICLE, WHEN IT STARTED TO ODOMETER AND ELECTRICAL COMPUTER SWITCH PROBLEMS. THE CONSUMER WAS TOLD MY A MERCEDES BENZ MECHANIC THAT THE ODOMETER PROBLEM COULD NOT BE E…
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COMPLAINT REGARDING INTERNATIONAL FRAUD AND HARASSMENT PRACTICES INVOLVING MERCEDES BENZ.*MR THE CONSUMER STATED THE VEHICLE HAD JUST OVER 31,000 MILES ON THE VEHICLE, WHEN IT STARTED TO ODOMETER AND ELECTRICAL COMPUTER SWITCH PROBLEMS. THE CONSUMER WAS TOLD MY A MERCEDES BENZ MECHANIC THAT THE ODOMETER PROBLEM COULD NOT BE EXPLAINED AND THE ELECTRICAL COMPUTER SWITCH WAS DESIGNED SO POORLY THAT THE MANUFACTURER STOPPED MAKING THEM AFTER ONLY TWO YEARS. *JB *NM
IF ONE OF THE HEADLAMP WIPER ARMS BECOMES MISALIGNED, THE WIPER BALDE CAN LODGE IN THE GROOVE UNDER THE HEADLAMP. IF THE WASHERS ARE ACTIVATED WITH THE WIPER BLADE IN THE MISALIGNED AND LODGED POSITION, THE WASHER PUMP WILL RUN CONTINUOUSLY EXPELLING ALL AVAILABLE FLUID.
Consequence & remedy
Consequence: PUMP OPERATION IN THE ABSENCE OF FLUID CAN CAUSE THE PUMP TO OVERHEAT AND CAUSE A VEHICLE FIRE.
Remedy: DEALERS WILL REPLACE THE HEADLAMP WASHER PUMP ON THESE VEHICLES.
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
0
No exact-year investigations in this snapshot.
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