1999 Mercedes-Benz S420 Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 1999 Mercedes-Benz S420

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1999 Mercedes-Benz S420 Problems

Bad Switch/Blower Motor Resistor Assembly May Cause Inoperative Heater Blower Motor

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

Poor AC Performance Due to Refrigerant Loss

A refrigerant leak may develop from one or more of the following AC components: AC compressor, hose manifold for the compressor, or the evaporator core. The loss of refrigerant can cause poor AC performance. Our technicians tell us that proper leak diagnoses should be performed in order to determine the cause of any refrigerant loss.

Emissions-related ports in cylinder head may clog

Ports in the cylinder head related to the emissions air injection and EGR systems can clog; the cylinder head should be removed and the ports cleaned.

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1999 Mercedes-Benz S420 Questions

there is cable at the back side at the end of the transmission that is leaking ? (1 answer)

had to remove the transmission cross member to get to it

What is wrong when the power locks stop working (1 answer)

How can I turn off the BAS/ASR and ABS dash warning lights on my 1999 S420? (3 answers)

I am trading in my 1999 MB S420 for a new car, but not a new Mercedes. My dash lights just came on and I don't want to trade in the car with the warning lights on. Can I temporarily turn them off? Thank you.

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