![]() The amplifier is what does all the heavy work of running the COMAND. The pre-facelift W221 S600 was equipped with the 5 Speed 722.6 transmission, as the 722.9 could not handle the torque of the V12 at the time. The right transmission expert can also take a used conductor plate and program it to match your Mercedes-Benz VIN. Today not only will the dealer sell the valve body to Independence repair shops, but now you can find third-party transmission experts that are capable of restoring your old TCU, valve body, and conductor plate. There are a number of companies that specialize in reprogramming used TCUs, a service that is not offered by any Mercedes-Benz dealership. Mercedes-Benz was refusing to sell these parts even to independent auto repair mechanics. This means they are both located inside the transmission. The valve body has the Transmission Control Unit (TCU) mounted on top. In the early days, the only one who could replace the valve body was at the dealer. The transmission control unit (TCU), valve body, or the conductor plate can fail, which sends the car in limp mode, and the transmission no longer shifts. Transmission ElectronicsĪnother common problem that affects the pre-facelift model (from 2007 to 2009) primarily has to do with transmission electronics found inside the 722.9 7-speed automatic transmissions. It is an easy job that any car owner with a few essential tools can complete in their driveway. It used to be a costly repair, but the price of a W221 air compressor has come down significantly you can find a replacement W211 air suspension compressor for under $150 online. It can be easily replaced in about an hour. The compressor is located behind the front bumper, passenger side. Once the air compressor fails, it causes the vehicle to drop to the ground, and the warning message "Stop Vehicle Too Low" displays on the dashboard. It often fails, or it might wear internally to the point where it's not generating enough pressure to raise the car. ![]() It is utilized to raise and lower the vehicle. The air compressor is the heart of the air suspension. The S-Class is equipped with air suspension. Replacing the auxiliary battery on a W221 is relatively easy and can be completed at home. The auxiliary battery mostly fails if the car is over 7 years old or has over 100,000 miles. Just like with any battery, it needs to be replaced. Because the W221 has an electronic transmission shifter, it is also used to put the vehicle in Park if the main battery fails. The main battery starts the engine, but the second auxiliary battery runs various electronics. This article discusses the most common problems that affect models such as S350, S550, and S400 Hybrid. That doesn't mean that the S-Class W221 has no issues. Even though it is such a complex luxury sedan, it is one of the most reliable S-class Mercedes-Benz has made in the last couple of decades.
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