Replace all fluids, replace belts and hoses. Check brakes for proper operation, get tires checked and replaced as needed. Replace wiper blades. Sitting unused is the worst thing for any vehicle. Check all lights for proper operation as well.
SOURCE: 1993 Mercedes Benz 300E, right rear squeak
Common causes for High-pitched noise from rear wheels are:
The wheel bearing: this is not usually dangerous in the short term, but I recommend contacting a mechanic and having it fixed. To test the wheel bearing, you lock front wheels, and jack up the car rear and spin the wheel (handbrake unlocked). If bearing is worn you hear a drone. When is the bearing, often car starts vibration above 40 mph.
Noise from bearing can be continuous, intermittent, only when steering, only when hot.
The brake pads: when brake pads are worn out they start making a squealing noise, in this case the noise is only when you brake or continuous. When you jack up the car the wheel may be a little stiff, but not necessarily.When brake pads are completely gone you also hear a scratching noise when braking. Inspect your brakes immediately.
Other suspension problems: Jack up the car as suggested above, check if the wheel has a slight play on the sides. Check all of the suspension components, suspension mounting points, and
steering linkage for damage. Also, check the frame rail for wrinkles. It is very important that these
components be in good condition, if you notice any problem here, go immediately to a mechanic.
Try doing the simple test above, reinstalling the wheel and working the tire back and forth. This
is a common test for bad ball joints and wheel bearings.
SOURCE: engine light 1999 mercedes e320
Most likely a gas cap or emissions issue, if you are sure the car is running fine. But you will have to have it scanned to know for sure.
SOURCE: 99 mercedes e320.check engine light on.po341
that appears to be a camshaft position sensor performance code. you can start by checking to see if the sensor is working properly, re-check and make sure that the harness is ok by checking the resistance through the harness if all looks well there make sure the computer has the latest software on it by having it scanned at your local dealer. also you can check the reluctor wheel on the camshaft for damage or debris in the way of the sensor.
hope this helps!
SOURCE: crankshaft sensor Mercedes E320
i have mercedes 94 e320 was run ok .but after engine wash
first coil no sparking ,and a the second quit too ,running only whit the third coil ,,i changed all 3 coils but runnig a same,,no sparks on those front 2
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I would change (all fluids) > Oil / filter, transmission fluid + flush, brake fluid & coolant. Then I would replace spark plugs, clean the throttle body and (maybe) a seafoam treatment if that looked really dirty. I would also run some injector cleaner with the first 2-3 fill ups, and pull the code for your check engine light to fix that problem.
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