Mercedes-Benz 400SEL Repair and Maintenance
A guide to problems, costs, maintenance and repair for your Mercedes-Benz 400SEL
Never overpay. Check prices with our estimator
Verified by mechanics, reported by drivers like you
Ask a mechanic in our community
Mercedes-Benz 400SEL ProblemsElectrical Issues Due to Degraded Engine Wiring Harness
The engine wiring can degrade because the insulating material falls off leaving the bare wire exposed. This can cause many problems depending on which wires are exposed and what they touch.
Problems with the pneumatic system can cause closing assist and door lock issues.
High mileage vehicles may develop a transmission fluid leak from one or more of the oil seals.
Mercedes-Benz 400SEL QuestionsMy tranny locks up in reverse. I can drive forward ok and runs good. (1 answer)
Car will not back up.
ok hello i have a 1993 400sel it has a problem with spark plugs, I replaced with new ones and the car is backfiring. i used ngk preset spark plugs, it was running fine for a few days when i was driving it around the block, but now it has began backfiring and will not fully start... I just bought ...