1989 Mercedes Benz 420 problems and owner complaints
Explore the records behind recurring owner reports.
Key facts
2 owner complaints analyzed
0 distinct recall campaigns
Not available median reported failure mileage
Scope: 1989 model year. Data updated: . 0 complaints include usable failure mileage. View data status.
This selection has limited data. It remains available for lookup but is excluded from search indexing.
Most common problems
Engine And Engine Cooling:Engine:Gasoline is the most frequently named component, appearing in 1 of 2 complaints (50.0%). A complaint can name multiple components.
Component breakdown
Number of unique complaints naming each component. Top eight shown.
| Category | Count |
|---|---|
| Engine And Engine Cooling:Engine:Gasoline | 1 |
| Vehicle Speed Control | 1 |
Engine And Engine Cooling:Engine:Gasoline: 1; Vehicle Speed Control: 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 | 0 |
| 75,000 to 99,999 | 0 |
| 100,000 to 149,999 | 0 |
| 150,000 and above | 0 |
Under 25,000: 0; 25,000 to 49,999: 0; 50,000 to 74,999: 0; 75,000 to 99,999: 0; 100,000 to 149,999: 0; 150,000 and above: 0
No usable failure mileage is recorded. 2 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 |
|---|---|
| 2000 | 2 |
2000: 2
Pattern summary
Engine And Engine Cooling:Engine:Gasoline leads the component reports. 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.
Vehicle analysis explorer
Inspect model-year patterns, reported mileage, monthly activity and the evidence behind each signal.
Data completeness
2 unique complaints in this selection. Analysis snapshot: 2026-10-01.
Missing, zero and invalid mileage is excluded. Dates after the snapshot are excluded. Examples are limited selections, not a representative sample.
Problems by model year
Model-wide comparison of the eight most reported components across the model. Cells show counts and shares within each model year. Open a cell for source examples.
| Component | 1986 | 1987 | 1988 | 1989 | 1990 | 1991 | 1994 | 1995 | 1996 | 1997 | 1999 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Electrical System | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 212.5%ODI 10225890 · 90,000 miI OWN A 1994 S 420 MERCEDES-BENZ I AM VERY CONCERNED FOR MY CHILD'S SAFETY AND MY OWN SAFETY AS WELL. THE WIRING HARNESS IS SHORTING OUT EVERYWHERE... SHAME ON MERCEDES-BENZ OF AMERICA..THEY KNOW ABOUT THIS DANGER AND JUST IGNORE THE WHOLE THING.. I'VE RESEARCHED IT REALLY WELL AND THE SAME PROBLEM OCCURS OVER AND OVER WITH ALL CARS OF THIS VINTAGE..I WONDER HOW MANY PEOPLE WILL HAVE TO DIE BEFORE THEY RECALL ON THIS DANGEROUS SITUATION???THEY SHOULD STAND UP TO THE PLATE.. THE HARNESS IS 7-8 HUNDRED DOLLARS.. COME ON GUYS!!! HOW MUCH DO YO… | 320.0%ODI 10235385 · 100,000 mi1995 420S MERCEDES IS HAVING PROBLEMS FIRING. CONCERNED ABOUT WIRING HARNESS. WAS CHECK AND MAY BE CAUSING THE PROBLEM. WHY IS THERE NOT A RECALL ON THIS IF SO MANY PEOPLE THAT OWN THESE VEHICLES ARE HAVING THE SAME PROBLEM? CAR IS HESITATING WHEN KEY IS TURNED TO RIGHT AND WILL NOT FIRE CORRECTLY. *TR | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. |
| Power Train:Automatic Transmission | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 213.3%ODI 489836VEHICLE CONTINUOUSLY VIBRATES WHEN IN ANY GEAR OTHER THAN NEUTRAL, DUE TO POSSIBLE DRIVE TRAIN COMPLICATIONS. *SKD | 00.0%No examples available for this selection. | 29.1% | 120.0%ODI 705376TRANSMISSION SLIPS INTO NEUTRAL WHILE DRIVING. THIS HAS OCCURRED 5 TIMES IN TWO WEEKS. IT IS CURRENTLY AT THE DEALER FOR REPAIR OF THIS DEFECT, AGAIN. *AK |
| Suspension:Front:Springs:Coil Springs | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 522.7%ODI 10061781WHILE VEHICLE SAT IDLING, THE RIGHT FRONT COIL SPRING SUDDENLY DETACHED FROM ITS WELDED POSITION. (NAR) *PH *CB | 00.0%No examples available for this selection. |
| Electrical System:Wiring:Front Underhood | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 16.3%ODI 10220009 · 139,595 miVEHICLE IS RUNNING ERRATICALLY. UPON INVESTIGATION, I FOUND THAT THE ENGINE WIRING HARNESS IN MODEL YEARS INCLUDING MY 1994 MERCEDES BENZ E420 HAVE A CHRONIC PROBLEM WITH DETERIORATING INSULATION. AS SOME FIRES AND CRASHES HAVE BEEN REPORTED, I AM PAYING TO HAVE THIS PART REPLACED. *TR | 320.0%ODI 10033790AFTER PARKING THE VEHICLE, THE CONSUMER NOTICED SMOKE COMING FROM THE STEERING COLUMN. AS A RESULT OF THE FAILURE, FIRE CAME THROUGH THE FIREWALL. THE LOCAL FIRE DEPARTMENT ARRIVED TO EXTINGUISH THE FIRE. *AK THERE WERE NO PRIOR PROBLEMS. THE VEHICLE HAD FILLED WITH BLACK SMOKE WITH THE IGNITION OFF AND THE VEHICLE PARKED. THERE WAS NO WARNING. *SCC *JB | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. |
| Service Brakes, Hydraulic:Antilock/Traction Control/Electronic Limited Slip | 00.0%No examples available for this selection. | 133.3%ODI 963593CONSUMER WAS DRIVING TRYING TO TURN A CURB THE ABS ANTI-LOCK BRAKE FAIL LOST CONTROL WAS IN A SINGLE CAR ACCIDENT CAR WAS TOTALED. TT | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 212.5%ODI 761678THE 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. … | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 120.0%ODI 723734STRANGE ELECTRONIC WHIRRING SOUND WHEN STARTING VEHICLE ON 6/7. SIDE VIEW MIRRORS SUDDENLY MOVED AND THEN CLOSED HALFWAY. NO RESPONSE FROM INTERIOR CONSOLE CONTROL. STEERING WHEEL ALSO BEGAN TO MOVE UP AND DOWN ON ITS OWN. REAR BRAKES CONTINUED TO SQUEAK AND GRAB. WERE REPLACED UNDER WARRANTY LAST NOVEMBER. |
| Suspension:Front | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 125.0%ODI 966799THE VEHICLE'S FRONT END WILL NOT STAY IN ALIGNMENT, CAUSING THE VEHICLE TO WANDER, ALSO EXCESSIVE WEAR ON THE TIRES. TT | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 313.6%ODI 10152198 · 102,000 miDT*: THE CONTACT STATED WHILE DRIVING 45 MPH THE VEHICLE WAS RIDING ROUGH. THE VEHICLE WAS SLOWED TO 5 MPH AND THE DRIVER SIDE FRONT COIL SPRING FELL OFF. THE VEHICLE WAS TOWED TO THE DEALERSHIP. THE DEALERSHIP DETERMINED THE BRACKET THAT HELD THE COIL SPRING ONTO THE FRAME HAD DISCONNECTED CAUSING THE COIL SPRING TO FALL OFF. THE LOCAL MERCEDES BENZ DEALER STATED THEY WOULD PAY HALF OF THE REPAIR IF DONE BY THEIR BODY SHOP. THE REPAIR WAS $2600. THE CONTACT WANTED THE REPAIRS DONE LOCALLY AND OPTED FOR THE DEAL. THE CONTACT CLAIMED T… | 00.0%No examples available for this selection. |
| Vehicle Speed Control | 116.7%ODI 969010THE CAR ACCELERATED WHEN TRYING TO STOP AT A LIGHT. PLEASE DESCRIBE. TT | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 150.0%ODI 731002FRON PARKED POSITION, WHEN VEHICLE PUT IN GEAR, CAR LUNGED FORWARD AT HIGH SPEED WITHOUT ENGAGING ACCELERATOR PEDAL. BREAK WOULD NOT STOP CAR. *AK | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 16.3%ODI 8012437AFTER COMING TO A COMPLETE STOP VEHICLE WILL TRY TO SURGE FORWARD WHILE CONSUMER APPLIES BRAKES. THIS HAS BEEN AN INTERMITTENT PROBLEM. CONTACTED DEALER, AND DEALER CANNOT FIND CAUSE. HAS REPLACED SEVERAL BRAKE PARTS BUT FOUND NOTHING.*AK. CONSUMER STATED INCIDENT HAPPENS WHEN THE VEHICLE HAS BEEN DRIVEN FOR AN HOUR OR MORE, THERE IS USUALLY A SOUND, CONSUMER ALSO STATED ALL 4 ROTORS HAVE BEEN REPLACED.*JB | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 14.5%ODI 506530CRUISE CONTROL IS LOCATED ON A SMALL STALK NEXT TO LARGER STALK FOR TURN SIGNALS, UPON TURNING, BOTH STALKS ARE MOVED, CAUSING CRUISE CONTROL TO COME ON. | 00.0%No examples available for this selection. |
| Air Bags:Frontal | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 125.0%ODI 10115576THE DRIVER'S SIDE AIR BAGS DID NOT DEPLOY WHEN THE CONSUMER WAS INVOLVED IN AN FRONT END COLLISION WITH HIS 1991 MERCEDES BENZ 420 SEL. **NAR*** *NM *SC *JB | 16.3%ODI 973045AIRBAG DID NOT DEPLOY WHILE INVOLVED IN AN ACCIDENT AT 30 MPH. TT | 16.7%ODI 502724NO DEPLOYMENT OF DRIVER'S AIRBAG, CAUSING INJURY IN ACCIDENT. *SD | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. |
Darker cells indicate a larger share of submitted complaints. Components overlap. This measures complaint composition, not failure probability.
Failure mileage by component
Median and middle 50% of usable owner-reported mileages. Ranges require at least five records.
| Component | Mileage range (25th–75th percentile) | Median | Usable records | Examples |
|---|---|---|---|---|
| No usable records for this analysis. | ||||
Complaint and recall timeline
Explore monthly filing activity alongside recall announcements. Up to ten years of monthly history is available.
Solid line: filed complaints. Dashed amber lines: recall announcement dates for this vehicle selection; markers include all recall components. The latest month is partial. Temporal proximity does not establish causation.
Monthly counts, recall campaigns and complaint examples
| Month | Complaints | Campaigns announced | Examples |
|---|---|---|---|
| 2024-11 | 0 | None | No examples available for this selection. |
| 2024-12 | 0 | None | No examples available for this selection. |
| 2025-01 | 0 | None | No examples available for this selection. |
| 2025-02 | 0 | None | No examples available for this selection. |
| 2025-03 | 0 | None | No examples available for this selection. |
| 2025-04 | 0 | None | No examples available for this selection. |
| 2025-05 | 0 | None | No examples available for this selection. |
| 2025-06 | 0 | None | No examples available for this selection. |
| 2025-07 | 0 | None | No examples available for this selection. |
| 2025-08 | 0 | None | No examples available for this selection. |
| 2025-09 | 0 | None | No examples available for this selection. |
| 2025-10 | 0 | None | No examples available for this selection. |
| 2025-11 | 0 | None | No examples available for this selection. |
| 2025-12 | 0 | None | No examples available for this selection. |
| 2026-01 | 0 | None | No examples available for this selection. |
| 2026-02 | 0 | None | No examples available for this selection. |
| 2026-03 | 0 | None | No examples available for this selection. |
| 2026-04 | 0 | None | No examples available for this selection. |
| 2026-05 | 0 | None | No examples available for this selection. |
| 2026-06 | 0 | None | No examples available for this selection. |
| 2026-07 | 0 | None | No examples available for this selection. |
| 2026-08 | 0 | None | No examples available for this selection. |
| 2026-09 | 0 | None | No examples available for this selection. |
| 2026-10 (partial) | 0 | None | No examples available for this selection. |
Emerging complaint spikes
Complete months in the latest six months with at least 10 complaints, at least twice the preceding 12-month average, and at least three square-root deviations above that average.
This is a descriptive screening rule, not a statistical defect finding. Publicity and reporting changes can increase submissions.
No complete months meet the spike thresholds for this selection.
Equal-age model-year comparison
Model-wide cumulative reports during the first three or five calendar years, starting with the model year (age 0). Only fully elapsed windows are compared.
1997: 2 complaints · 1999: 5 complaints
| Model year | Through age 0 | Through age 1 | Through age 2 |
|---|---|---|---|
| 1997 | 1 | 1 | 2 |
| 1999 | 3 | 4 | 5 |
Date coverage across each selected cohort
| Year | Incident dates used | Filing date fallbacks | Excluded dates |
|---|---|---|---|
| 1997 | 18 | 1 | 3 |
| 1999 | 5 | 0 | 0 |
Incident date is preferred when valid and no later than filing; otherwise filing date is used. Model year approximates age. Equal observation time does not adjust for sales, distance driven or reporting delays. One complaint linked to multiple model years can appear in each cohort.
Components reported together
Each cell counts unique complaints naming both components. Open a nonzero cell for examples.
| Component | Engine And Engine Cooling:Engine:Gasoline | Vehicle Speed Control |
|---|---|---|
| Engine And Engine Cooling:Engine:Gasoline | — | 0 |
| Vehicle Speed Control | 0 | — |
Co-reporting does not establish that one component caused another concern.
Recurring narrative patterns
Specific keyword mentions beyond broad component labels. Matching includes negations and comparisons and does not confirm a diagnosis.
0 patterns with matching reports.
No narratives match the published patterns.