Mercedes-Benz 400SEL Repair and Maintenance

A guide to problems, costs, maintenance and repair for your Mercedes-Benz 400SEL

Mercedes-Benz 400SEL Problems

Insulation Degrades on Engine Wiring Harness and Leaves Conductors Exposed

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.

Closing Assist/Door Lock Issues Due to Pneumatic System Problems

Problems with the pneumatic system can cause closing assist and door lock issues.

Transmission Oil Seals May Leak on High Mileage Vehicles

High mileage vehicles may develop a transmission fluid leak from one or more of the oil seals.

See More Problems (30)

Mercedes-Benz 400SEL Questions

My dashboard light is off on my 400SEL. How do I fix it? (3 answers)

I replaced sparkplugs and now car is backfiring, what is the issue? (1 answer)

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 ...

door locks has stopped working, have to lock with key. (1 answer)

sometimes they work and at times do not work.

See More Questions (15)