1990 Mercedes-Benz 420SEL Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 1990 Mercedes-Benz 420SEL

Other than a defective motor, a bad switch or blower motor resistor assembly can cause an inoperative heater blower motor.

It is not uncommon for the idle air compensator to get stuck in one position, resulting in the engine idle speed (rpm) being too high or too low. Replacement of the failed compensator may be necessary to correct this concern.

The timing chain and timing chain guides wear; they should be replaced every 100,000 miles.

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The economy needle has gone from black all the way to red.

as soon as the car run the abs ligth in the dash goes on. in reverse the car don't do that

1986 Mercedes 420SEL. Have slight vibration coming from rear end.

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what other automobile would you even consider that has 150k miles and still cost $5k or better..and get a consistent thumbs up!

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