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Problems for specific Mercedes-Benz E420 years:

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Repairpal verified 1997 Mercedes-Benz E420 problems

 

Verified for the Mercedes-Benz E420

The mass air flow sensor can fail, resulting in poor fuel economy and Check Engine Light illumination.

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Verified for the Mercedes-Benz E420

The evaporator temperature sensor can fail, causing the AC compressor not to cycle. If the AC compressor does not turn on, the AC system will not blow cold air. If the compressor is stuck on, the air will be very cold at first, before warming up.

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Verified for the Mercedes-Benz E420

Failed spark plug wires and/or ignition coils can cause intermittent misfires (rough running); the Check Engine Light may also illuminate. Diagnoses of the ignition system will be necessary to determine which components are at fault.

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Verified for the Mercedes-Benz E420

Instrument cluster displays tend to fail, especially the clock and gear indicators; the instrument cluster needs to be replaced.

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Verified for the Mercedes-Benz E420

Irregular and premature tire wear can be caused by the lower control arm bushings cracking, resulting excessive movement at the control arm pivot point. Ball joints can also wear out prematurely, causing similar tire wear symptoms. I some cases it may be necessary to replace the lower control arm, including bushings & ball joint to correct this concern.

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Verified for the Mercedes-Benz E420

A squeak from the steering column is often related to a rubber boot in the column or a seal in the power steering rack.

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Verified for the Mercedes-Benz E420

The cooling system hoses may fail unexpectedly. The hoses can look good on the outside, but the rubber can degrade and erode on the inside. If not carefully checked, the hoses can burst at any time.

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Verified for the Mercedes-Benz E420

The switch for the vanity mirror light above the sun visor fail; there is an updated switch for some models. On the remaining models, due to a redesign, the mirror "cassette" will need replacement.

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Verified for the Mercedes-Benz E420

The electronic throttle assembly may suffer an electrical failure. It is often cheaper to send the valve to a service center for repair that to purchase a new part.

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Verified for the Mercedes-Benz E420

Brake lamp housings can melt, resulting in a loss of contact for the brake light bulb holder. If this happens, the brake light will not work. Replacement of the damaged lamp housing should correct this problem.

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Verified for the Mercedes-Benz E420

A coolant leak may develop form the Radiator due to degradation of its plastic components. Replacement of the failed radiator will be necessary.

8 Reports
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Verified for the Mercedes-Benz E420

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

3 Reports
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Verified for the Mercedes-Benz E420

The emissions air injection pump can seize, causing a loud squealing noise followed by smoke from the drive belt. If the engine is not turned off, the belt will break, turning on the alternator/battery warning light.

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Verified for the Mercedes-Benz E420

As brake fluid becomes dirty over time, it can cause a failure of the anti-lock brake system (ABS) modulator assembly. Our technicians recommend a complete brake system flush every two years to help prevent this issue.

3 Reports
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Verified for the Mercedes-Benz E420

A malfunctioning HVAC blower motor regulator can cause the blower motor to operate below the requested speed or not at all. Updated regulators are available; the blower motor and cover need to be replaced at the same time to upgrade the system.

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