We encounter many problems dealing with Mercedes-Benz repairs in our Marietta, GA shop. From mechanical issues to electrical issues, there are many common problems that can affect these luxury European cars. Here we list some of the more common problems that occur and how you can look out for them because you will end up paying more to fix other problems if you let these persist.
Car does not start but does crank
If you find your car will crank but does not start, then the issue is most likely the crank shaft position sensor. If the sensor does not communicate properly with the engine, then the engine will not start. Most commonly, you will begin experiencing longer crank times (the amount of time it takes for the car to start when you first turn the key) before the sensor finally fails. Replacing the sensor is the only way to resolve this problem.
Shifter won’t go out of the parking gear
If you find that your car starts, but you cannot move the gear out of park, then a common problem is a failure of the selector module. This problem is most commonly found on E and S class models of Mercedes. As with many issues, you can detect signs of an impeding failure beforehand. If you notice that the shifter becomes more and more difficult to move, then this problem may be right around the corner.
Rattling when car starts (especially when cold)
If you experience a rattling from the engine during the first 30 seconds of startup, then the problem is commonly a belt tensioner that has worn out. Although this is a common issue if you keep your car out in the cold, you may have other issues if the problem persists. Water pump pulleys will give similar symptoms. It is important to diagnose and repair this issue the moment you begin noticing it, or else you may find yourself stranded without a belt.
Rattling from the rear of the car
One of the most common reasons why there might be rattling in the rear suspension is due to a break in the lower rear spring. If this spring breaks, then it will leave the coil in the rear spring pocket. The broken pieces will rattle around as you drive your car. If you notice that the ride height has changed (not always obvious), then that is yet another indication that this problem has occurred. This issue should obviously be changed as soon as possible. The repairs are usually done for pairs of springs in order to avoid future complications.
Fluid is leaking at the center of the car
This is a common problem especially on older models of Mercedes-Benz. If you find red fluid near the center, then you can be fairly sure that you have a transmission fluid leak. There are a large number of causes for these leaks. Anything from leaks within the seal of the transmission pan to the electrical transmission plug attached to the transmission itself. If you notice that only a small amount of fluid is leaking out, then you can be sure that more will come later. If you allow this to continue, then the lower amounts of fluids within the transmission can cause many other mechanical problems.
Ignition key doesn’t turn
If you find that the key will not turn, then this may be a problem with the EIS module. As with many other problems, there will be signs of wear beforehand. If you notice it becomes increasingly more difficult to turn the key before starting your car, then this issue may occur soon.
Front of the car is lowered
Mercedes S-class models will be fitted with air-ride suspensions. It is common for two corners of these cars to fail. Due to these failures, the car may lower quite a bit, even to the point where it cannot be driven anymore. The most common cause of this issue is leaking struts. These can be relatively easy to repair depending on if the shocks need to be replaced or not.