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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSMERCEDES BENZ1989420SELREPAIR AND DIAGNOSIS (SINGLE PAGE)MAINTENANCEPROCEDURESMAINTENANCE REMINDER LIGHT (RESET PROCEDURES)MAINTENANCE SERVICE REMINDER (SERVICE INDICATOR)MAINTENANCE SERVICE REMINDER RESET - PROCEDURE 05WITH MULTIFUNCTION STEERING WHEEL (4 BUTTONS) - AP00.20-P-0042CW
1989 Mercedes Benz 420SEL
With Multifunction Steering Wheel (4 Buttons) - AP00.20-P-0042CW
1989 Mercedes Benz 420SELSECTION With Multifunction Steering Wheel (4 Buttons) - AP00.20-P-0042CW
| Step | Adjust | Additional Information |
|---|---|---|
| 1 | Close trunk lid or liftgate as well as engine hood and doors | Vehicles with code (491) USA version or code (494) USA version |
| 2 | Turn key in ignition switch to position "1" | The standard display (kilometer counter) must appear in the multifunction display (A1p13), if necessary press the system selection button repeatedly (S110s3). |
| 3 | First press button R (S1 10s7) and keep pressed, then 1 also press and keep pressed button + (S111s1) within a second (A1pi3). | Keep both buttons (S110s7, S111s1), pressed for approx. 5 seconds: The voltage indicator appears in the multifunction display |
| 4 | Press system selection button (S110s3) | "ASSYST PLUS" appears in the multifunction display (A1p13). |
| 5 | Press button R (S110s7) | Service data appears in the multifunction display (A1p13). |
| 6 | Press system selection button (S110s3) | The "Full service" appears in the multifunction display (A1p13). |
| 7 | Press button R (S110s7) | The current services appear in the multifunction display (A1p13). |
| 8 | Press the "System selection button" (S110s3) repeatedly until (A1p13) "Confirm service?" appears in the multifunction display | |
| 9 | Press button R (S110s7) Service information: Introduction of oil selection in instrument cluster |
Service completed? appears in the multifunction display (Al p13). Vehicles with engine 271, 272 and VIN A as of 184624, VIN F as of 198708, VIN R as of 039071: Select and confirm specification of engine oil used To reach the maximum kilometer interval of 25, 000 km/1 year, engine oil as per the Specifications for Operating Fluids, Sheet 229.5 must be used and confirmed |
| 10 | Press button + (S111 s1) | "No take-back" appears in the multifunction display (Al p13). |
| 11 | Press button + (S111s1) | "Full service carried out" appears in the multifunction display (Al p13). |
| 12 | Press the "System selection button" (S110s3) repeatedly until (A1p13) the standard display (kilometer counter) appears in the multifunction display | |
| 13 | Turn key in ignition lock to position "0" |
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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.