Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMERCEDES BENZ1989420SELREPAIR AND DIAGNOSIS (SINGLE PAGE)GENERAL INFORMATIONMAINTENANCE REMINDER LIGHT (RESET PROCEDURES)MAINTENANCE SERVICE REMINDER (SERVICE INDICATOR)MAINTENANCE SERVICE REMINDER RESET - PROCEDURE 20AP00.20-S-0040EB
1989 Mercedes Benz 420SEL
Maintenance Service Reminder Reset - Procedure 20: AP00.20-S-0040EB
1989 Mercedes Benz 420SELSECTION AP00.20-S-0040EB
| Step | Adjust | Additional Information |
|---|---|---|
| 1 | Set ignition lock to position 2 | Only on model 447.6/7 with engine 622 |
| 2 | Press scroll back button (4) to highlight "Full Service" and confirm selection with OK button (3) | The current service items appear on the multifunction display (6) |
| 3 | Press "System Selection" button (1) repeatedly until workshop menu with "Vehicle Data", "Dynamometer Test", and "ASSYST PLUS" tabs appear in the multifunction display (6) | |
| 4 | Press the "Scroll Forward" button (4) repeatedly until "ASSYST PLUS" is highlighted and confirm with OK button | The workshop menu with the "Service Data", Full Service", and "Oil Measurment" tabs appear in the multifunction display (6) |
| 5 | Press the "Scroll Forward" button (4) repeatedly until "Full Service" is highlighted and confirm with OK | The multifunction display then shows (e.g. "Service A" and "Confirm with OK") |
| 6 | Confirm with OK | The multifunction display shows the oil selection |
| 7 | Select specification of used engine oil using "Scroll Forward" button (4) and confirm with OK | The multifunction display then shows "Service Conducted" In order to achieve the maximum kilometer interval with engine 274: Use engine oil as per Specifications for Operating Fluids sheet 229.5 Multigrade engine oils (specification 229.5) In order to achieve the maximum kilometer interval with engine 622: Use engine oil as per Specifications for Operating Fluids sheet 228.51 Low SPAsh multigrade service engine oils (specification 228.51) In order to achieve the maximum kilometer interval with engine 651: Use engine oil as per Specifications for Operating Fluids sheet 229.51 Low SPAsh multigrade service engine oils (specification 229.51) |
| 8 | Press "Scroll Forward" button (4) until "Yes" is highlighted and confirm with OK | "Reversal not possible" is shown on the multifunction display (6) |
| 9 | Press "Scroll Forward" button (4) until "Confirm" is highlighted and confirm with OK | "Full service completed" appears on the multifunction display (6). If the service is not performed or only partly performed after resetting the maintenance computer the maintenance computer has to be reset to the default value again and the service indicator must be reset to the previous service |
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.