Due to wear, high usage vehicles can experience ignition lock and tumbler failures. The ignition lock cylinder will generally require replacement to correct this concern.
Resources for the Repair and Maintenance of your Mercedes-Benz E420
Mercedes-Benz E420 Models:
Mercedes-Benz E420 Problems
Oil feed tubes break and fall into the crankcase (engine) and the tappet becomes noisy (ticking), resulting in degraded idle quality. Our technicians recommend replacing all of the tubes at the same time, broken or not.
A coolant leak may develop form the Radiator due to degradation of its plastic components. Replacement of the failed radiator will be necessary.
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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A faulty mass air flow (MAF) sensor can cause erratic/rough engine operation and fuel economy issues. Since this sensor measures the actual amount of air entering the motor, when it fails, the engine control module (ECM) takes the wrong information and delivers incorrect volumes of fuel to the cylinders.
Mercedes-Benz E420 Recalls (Recent)
Summary: VEHICLE DESCRIPTION: PASSENGER VEHICLES. SOME OF THESE VEHICLES HAVE EXPERIENCED SIDE AIR BAG DEPLOYMENTS IN THE ABSENCE OF A CRASH.Learn more »
Mercedes-Benz E420 Questions and Answers
My blower doesn't kick on when I have the A/C on. The compressor is working fine, but the blower doesnt engage. Is the blower the primary culprit or are there other things I need to look at? A...
My 1994 E420 blower doesn't engage when in heat or A/C. The compressor kicks on and the line is cold and no leaks in the lines good pressure. So do I have a definite blower problem? I dont thi...
engine misses slow speed/rpm. could it be fuel filter? Or needing tuneup?
Will the catalytic converter be damage due to excessive heat.
Mercedes-Benz E420 Reviews
Great car but has a poor Electrical Wiring System
The ASR light came out and the ABS light same time came on and all gauges stopped working. When engine was shut off, it could not be started and all the lights came on.
This is a wonderful automobile. You have to drive one to know.
1997 E420 Sport - My first Mercedes, bought from a friend's estate. Car is a creampuff, 95,000 miles and all dealer serviced. The exhaust system is like a new car, not rusted, the chassis is really olid,again no rot. The materials used are very high quality and the car holds up well as a result. Over the years and during the extended warranty the tranny was replaced, as was the AC blower motor. These are both problem areas in these cars , since repairs exceed the car value in many cases.
The V8 is very strong ,great mileage over 20mpg in everyday use. It is fairly quick but hampered by the ASR and traction control which limits jack rabbit starts. Top end is another matter altogether - 100 mph comes up quickly when passing. Theoretically, the car goes as fast in 3rd - 130mph - as it does in 5th, so it is an autobahn warrior. Rather amazing for a 12 year old car. There are not many places where I can get away with my speed tests, but we have a nice quiet 5 mile stretch near the ocean that makes me appreciate the wonderful brakes that Mercedes puts on all their cars.
These cars are dirt cheap today, and can be expensive to maintain - but they are worth every penny in satisfaction.