1994 Mercedes Benz 420 problems and owner complaints
Explore the records behind recurring owner reports.
Key facts
12 owner complaints analyzed
0 distinct recall campaigns
110,125 mi median reported failure mileage
Scope: 1994 model year. Data snapshot: . 6 complaints include usable failure mileage.
Most common problems
Electrical System is the most frequently named component, appearing in 2 of 12 complaints (16.7%). A complaint can name multiple components.
| Topic | Matching reports | Share of complaints |
|---|---|---|
| Electrical and battery issues | 6 | 50.0% |
| Braking behavior | 4 | 33.3% |
| Transmission and shifting | 1 | 8.3% |
| Engine operation | 1 | 8.3% |
Topic matches use published keyword rules. They describe mentions, including negations or comparisons, and do not confirm a diagnosis. Read the matching rules.
Component breakdown
Number of unique complaints naming each component. Top eight shown.
| Category | Count |
|---|---|
| Electrical System | 2 |
| Electrical System:Wiring | 2 |
| Service Brakes, Hydraulic:Antilock/Traction Control/Electronic Limited Slip | 2 |
| Air Bags:Frontal | 1 |
| Electrical System:Wiring:Front Underhood | 1 |
| Engine And Engine Cooling | 1 |
| Service Brakes, Hydraulic:Foundation Components | 1 |
| Service Brakes, Hydraulic:Foundation Components:Disc:Pads | 1 |
Electrical System: 2; Electrical System:Wiring: 2; Service Brakes, Hydraulic:Antilock/Traction Control/Electronic Limited Slip: 2; Air Bags:Frontal: 1; Electrical System:Wiring:Front Underhood: 1; Engine And Engine Cooling: 1; Service Brakes, Hydraulic:Foundation Components: 1; Service Brakes, Hydraulic:Foundation Components:Disc:Pads: 1
Reported problems by failure mileage
Complaint counts in mileage bands. These are not failure rates per vehicle or mile.
| Category | Count |
|---|---|
| Under 25,000 | 0 |
| 25,000 to 49,999 | 0 |
| 50,000 to 74,999 | 1 |
| 75,000 to 99,999 | 1 |
| 100,000 to 149,999 | 3 |
| 150,000 and above | 1 |
Under 25,000: 0; 25,000 to 49,999: 0; 50,000 to 74,999: 1; 75,000 to 99,999: 1; 100,000 to 149,999: 3; 150,000 and above: 1
100,000 to 149,999 miles has the most reports with usable mileage (3). 6 complaints have missing, zero or invalid mileage.
Complaints over time
Year the complaint was filed, not the vehicle model year or incident year. The snapshot year is partial.
| Category | Count |
|---|---|
| 1995 | 3 |
| 2002 | 2 |
| 2003 | 1 |
| 2006 | 2 |
| 2007 | 1 |
| 2008 | 2 |
| 2012 | 1 |
1995: 3; 2002: 2; 2003: 1; 2006: 2; 2007: 1; 2008: 2; 2012: 1
Pattern summary
Electrical System leads the component reports. Electrical and battery issues appears in 6 complaint narratives. Braking behavior appears in 4 complaint narratives. Transmission and shifting appears in 1 complaint narratives. Use these patterns to inspect individual reports and prepare questions for a mechanic.
Calculated from recorded counts. An AI narrative has not been published for this selection.
Complaint evidence
Examples provide context, not a representative sample or a verified diagnosis.
Owner report 10157901 · 2006-05-19 (May 19, 2006)
5/18/2006. CHECK ENGINE LIGHT APPEARED. TOOK VEHICLE TO MBZ REPAIR SHOP AND FOUND THE ENGINE WIRING HARNESS'S WIRE INSULATION BREAKING APART AND EXPOSING THE BARE WIRING. COST OF REPAIR +$900.00. *JB
Owner-reported narrative. Look up ODI 10157901 at NHTSA ↗
Owner report 10169170 · 2006-09-25 (September 25, 2006)
VEHICLE CHECKED AND FOUND THAT INSULATION ON ALL OF THE FUEL INJECTION WIRING, TEMPERATURE SENSOR AND FAN THERMAL SWITCH HARNESS DETERIORATED CAUSING WIRES TO RUB TOGETHER. CONSUMER DISCOVERED THAT HARNESS INSULATION IS MADE OF VERY POOR MATERIAL. THE INSULATION BREAKS VERY EASY AT THE TOUCH AND TURNS INTO DUST. THE WHOLE WIRE HARNESS IS IN THE SAME SITUATION THIS IS A MAJOR SAFETY ISSUE CAN STALL OR SHUT OFF WHILE DRIVING AT HIGH SPEED. REPLACE OF WIRE HARNESS AT A COST OF$1500 WAS NEEDED TO FIX. *JB
Owner-reported narrative. 117,000 miles reported. Look up ODI 10169170 at NHTSA ↗
Owner report 477769 · 1995-01-09 (January 9, 1995)
FRONT BRAKE PADS SQUEAK, CAUSING ANTI-LOCK BRAKE SYSTEM TO ACTIVATE. *SKD
Owner-reported narrative. Look up ODI 477769 at NHTSA ↗
Owner report 761678 · 2002-05-08 (May 8, 2002)
THE PROBLEM STARTED LAST AUGUST. IT OCCURRS ONLY OCCASIONALLY AND HAS NEVER BEEN DUPLICATED WHEN AT A DEALERSHIP OR REPAIR SHOP. AFTER APPLYING THE BRAKES AND COMING TO A STOP, THE CAR STARTS TO ROLL FORWARD. WHEN I TAKE MY FOOT OF THE BRAKE PEDAL AND REAPPLY IT, THE CAR THEN STOPS. HOWEVER, ON APRIL 7TH WHEN THIS OCCURRED REAPPLYING THE BRAKE DID NOT STOP THE CAR AND I ROLLED INTO THE REAR END OF A TRATOR TRAILER TRUCK WHO WAS STOPPED AT A RED LIGHT. IN NOVEMBER 2001 I TOOK THE CAR TO THE MERCEDES DEALERSHIP IN HAVERHILL, MA SMITH MOTORS. …
Owner-reported narrative. Look up ODI 761678 at NHTSA ↗
Owner report 10452795 · 2012-03-23 (March 23, 2012)
CAR STOPPED SHIFTING, CHECK ENGINE LIGHT AND ASR LIGHT APPEARED WHILE DRIVING. TOOK CAR INTO AUTO MECHANIC AND WAS TOLD WIRING HARNESS WOULD NEED TO BE TOTALLY REPLACED AND WOULD COST MORE THAN AUTO'S WORTH. SAID THESE CARS WERE NOTORIOUS FOR HAVING WIRING HARNESS PROBLEMS AND CAN NOT BELIEVE IT HAS NOT CAUGHT ON FIRE YET. *TR
Owner-reported narrative. 170,000 miles reported. Look up ODI 10452795 at NHTSA ↗