1995 Mercedes-Benz S420 Problems
Owner-reported complaints filed with NHTSA, grouped by component
Data refreshed
What this page shows
Everything below is an owner-reported complaint submitted to NHTSA about the 1995 Mercedes-Benz S420, grouped by the component NHTSA recorded on the report. These are not confirmed defects, and they are not recalls. NHTSA does not verify most reports before publishing them, and a category with more reports in it is not evidence that a part is defective.
Complaints are reports submitted by owners and drivers to NHTSA. They are not verified and do not establish that a defect exists.
Reports by component
Ranked by how many owner reports name each component category
- Electrical444.4%
- Heating & air conditioning111.1%
- Driver assistance111.1%
- Engine111.1%
- Fuel system111.1%
- Powertrain (other)111.1%
Percentages are of component mentions. A single complaint can name more than one component, so these do not sum to the total complaint count.
Each component in detail
What the reports in each category say, in the owners' own words
Electrical
Reports naming the electrical system — wiring, battery, charging, control modules, infotainment and electrical accessories.
From owner reports, verbatim
ELECTRICAL WIRING HARNESS USING SOY BASED INSULATION DEGRADES THEREBY ALLOWING WIRES TO SPONTANEOUS AND/ OR INTERMITTENT SHORTS. THIS HAS CAUSED EXTREMELY DANGEROUS DRIVING SITUATIONS. VERY DIFFICULT TO TROUBLESHOOT UNLESS AND UNTIL ONE DISCOVERS INSULATION FAILURE. THIS HAS BEEN AND IS WIDELY KNOWN TO BE A PROBLEM WITH THIS ERA OF CARS. EXTREMELY BAD ENGINEERING DECISIONS WERE MADE. VERY SERIOUS AND POTENTIALLY DANGEROUS CONDITIONS. MERCEDES SHOULD BE HELD ACCOUNTABLE FOR MALFEASANT AND A RECALL SHOULD HAVE BEEN MADE. I BOUGHT THE CAR NEW; HAD SERVICE ONLY AT THE DEALER; WAS NEVER NOTIFIED OF THE PROBLEM. I HAVE OLDER CARS WITH MORE MILEAGE WHICH DO NOT HAVE THE PROBLEMS I HAVE WITH THE MERCEDES. VERY DISAPPOINTING. WILL NEVER BUY ANOTHER MERCEDES; ALL HYPE! *TR
THROTTLE BODY WIRE HARNESS WENT BAD AND WAS ON INTERSTATE AND COULD NOT DO SPEED LIMIT AND NEARLY GOT DEMOLISHED BY A SEMI TRACTOR TRAILER. AFTER A HORRIBLE EXPENSE I NOW FIND OUT THE WIRING HARNESS FOR THE CAR IS BAD AS WELL. WELL DONE MERCEDES BENZ YOU HAVE ENDANGERED MY FAMILY'S LIVES WITH YOUR SUB STANDARD BUSINESS PRACTICE. YOU SHOULD BE FORCED TO RECALL AND REPAIR ALL SAFETY ISSUES.
Too few reports in this category for a page of its own — they appear in the full complaint list.
Heating & air conditioning
Reports naming the heating, ventilation and air-conditioning system.
From owner reports, verbatim
A/C QUIT WORKING. TOOK TO THE MERCEDES DEALER. WAS NOTIFIED OF VAPOR CORE FAILURE AND TOLD IT IS MOST COMMON ON ANY MILEAGE OF THIS MODEL. COST $3500.00 IF IT IS MOST COMMON IT SHOULD HAVE BEEN A RECALL ON IT. COMPANY KNEW ABOUT THE PROBLEM BUT DID NOTHING TO CORRECT IT.
Too few reports in this category for a page of its own — they appear in the full complaint list.
Driver assistance
Reports naming forward-collision avoidance, lane keeping, back-over prevention, cruise control and related electronic driver-assistance systems.
From owner reports, verbatim
THROTTLE BODY WIRE HARNESS WENT BAD AND WAS ON INTERSTATE AND COULD NOT DO SPEED LIMIT AND NEARLY GOT DEMOLISHED BY A SEMI TRACTOR TRAILER. AFTER A HORRIBLE EXPENSE I NOW FIND OUT THE WIRING HARNESS FOR THE CAR IS BAD AS WELL. WELL DONE MERCEDES BENZ YOU HAVE ENDANGERED MY FAMILY'S LIVES WITH YOUR SUB STANDARD BUSINESS PRACTICE. YOU SHOULD BE FORCED TO RECALL AND REPAIR ALL SAFETY ISSUES.
Too few reports in this category for a page of its own — they appear in the full complaint list.
Engine
Reports naming the engine itself — including stalling, misfires, oil consumption, cooling and internal engine components.
From owner reports, verbatim
ELECTRICAL WIRING HARNESS USING SOY BASED INSULATION DEGRADES THEREBY ALLOWING WIRES TO SPONTANEOUS AND/ OR INTERMITTENT SHORTS. THIS HAS CAUSED EXTREMELY DANGEROUS DRIVING SITUATIONS. VERY DIFFICULT TO TROUBLESHOOT UNLESS AND UNTIL ONE DISCOVERS INSULATION FAILURE. THIS HAS BEEN AND IS WIDELY KNOWN TO BE A PROBLEM WITH THIS ERA OF CARS. EXTREMELY BAD ENGINEERING DECISIONS WERE MADE. VERY SERIOUS AND POTENTIALLY DANGEROUS CONDITIONS. MERCEDES SHOULD BE HELD ACCOUNTABLE FOR MALFEASANT AND A RECALL SHOULD HAVE BEEN MADE. I BOUGHT THE CAR NEW; HAD SERVICE ONLY AT THE DEALER; WAS NEVER NOTIFIED OF THE PROBLEM. I HAVE OLDER CARS WITH MORE MILEAGE WHICH DO NOT HAVE THE PROBLEMS I HAVE WITH THE MERCEDES. VERY DISAPPOINTING. WILL NEVER BUY ANOTHER MERCEDES; ALL HYPE! *TR
Too few reports in this category for a page of its own — they appear in the full complaint list.
Fuel system
Reports naming fuel storage or delivery — tanks, pumps, lines, injectors and fuel leaks.
From owner reports, verbatim
THROTTLE BODY WIRE HARNESS WENT BAD AND WAS ON INTERSTATE AND COULD NOT DO SPEED LIMIT AND NEARLY GOT DEMOLISHED BY A SEMI TRACTOR TRAILER. AFTER A HORRIBLE EXPENSE I NOW FIND OUT THE WIRING HARNESS FOR THE CAR IS BAD AS WELL. WELL DONE MERCEDES BENZ YOU HAVE ENDANGERED MY FAMILY'S LIVES WITH YOUR SUB STANDARD BUSINESS PRACTICE. YOU SHOULD BE FORCED TO RECALL AND REPAIR ALL SAFETY ISSUES.
Too few reports in this category for a page of its own — they appear in the full complaint list.
Powertrain (other)
Powertrain reports that are not specifically the engine or transmission — driveshafts, axles, transfer cases and differentials.
From owner reports, verbatim
ELECTRICAL WIRING HARNESS USING SOY BASED INSULATION DEGRADES THEREBY ALLOWING WIRES TO SPONTANEOUS AND/ OR INTERMITTENT SHORTS. THIS HAS CAUSED EXTREMELY DANGEROUS DRIVING SITUATIONS. VERY DIFFICULT TO TROUBLESHOOT UNLESS AND UNTIL ONE DISCOVERS INSULATION FAILURE. THIS HAS BEEN AND IS WIDELY KNOWN TO BE A PROBLEM WITH THIS ERA OF CARS. EXTREMELY BAD ENGINEERING DECISIONS WERE MADE. VERY SERIOUS AND POTENTIALLY DANGEROUS CONDITIONS. MERCEDES SHOULD BE HELD ACCOUNTABLE FOR MALFEASANT AND A RECALL SHOULD HAVE BEEN MADE. I BOUGHT THE CAR NEW; HAD SERVICE ONLY AT THE DEALER; WAS NEVER NOTIFIED OF THE PROBLEM. I HAVE OLDER CARS WITH MORE MILEAGE WHICH DO NOT HAVE THE PROBLEMS I HAVE WITH THE MERCEDES. VERY DISAPPOINTING. WILL NEVER BUY ANOTHER MERCEDES; ALL HYPE! *TR
Too few reports in this category for a page of its own — they appear in the full complaint list.
Higher-selling and older vehicles accumulate more reports. Counts are not failure rates and are not directly comparable between vehicles that sold in very different numbers.
Elsewhere on this vehicle
Data sources
- NHTSA Office of Defects Investigation — owner-reported complaints and the components recorded on them
Data on this page last refreshed .