Mercedes-Benz S420 Repair and Maintenance

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

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Mercedes-Benz S420
$
2,220
to $
3,613
Mercedes-Benz S420
$
106
to $
161
Mercedes-Benz S420
$
448
to $
816
Mercedes-Benz S420
$
171
to $
383
Mercedes-Benz S420
$
888
to $
1,200

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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Mercedes-Benz S420 Recalls

Recall 96V058000
THE DRIVE BELT PULLEY ON THE ENGINE CAN DEVELOP FATIGUE CRACKS IN THE METAL AND BREAK. IF THE DRIVE PULLEY BREAKS, THE CAR WOULD NOT HAVE ENGINE COOLING, BATTERY CHARGING, AND/OR POWER STEERING.

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Mercedes-Benz S420 Reviews

the heater valve blowing warm air out of the vents and air condition works off and on. I was told if I by pass the heater valve Ill have good air condition but no heat until I replace the heater valve. rather have cold then heat right now. And I was told I can rebuild the heater valve, so 1, how do I bypass the heater valve and 2 is there a kit to rebuild the heater valve and where do I buy it?...
what cause my S420 Mercedes to lose power when accelerate from stop it sound like the plug missing fire it does it after driven a few miles stopping to a stop it get worse as I go along and stop at a red light or stop for any purpose.Sometimes when I shut car off and let engine cool down about30 to 45 minutes the car will run better.
heater dont work and shifter dont work it go in different spot drive is revers 3 is drive. what can i do.

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