Lack of audio or cell phone functionality may be related to the failure of the audio gateway module.
Resources for the Repair and Maintenance of your 2009 Mercedes-Benz CLS63 AMG
2009 Mercedes-Benz CLS63 AMG
2009 Mercedes-Benz CLS63 AMG Problems
Rear air springs (bellows) may develop leaks, which causes the air pump to run more often to maintain ride height. Our technicians recommend that leaking air springs be replaced.
The ESP and BAS warning lights may illuminate due to a failed brake light switch. Replacement of the failed switch should correct this concern.
Irregular and premature tire wear can be caused by the front thrust link bushings cracking and causing excessive movement in the suspension. The thrust link bushings are fluid-filled (to help reduce vibration), so if they crack, they will leak oil.
It is not uncommon to encounter premature failure of the anti-lock brake system (ABS) modulator assembly due to dirty brake fluid. Our technicians recommend flushing the brake fluid every two years in order to help prevent this problem.