2009 Mercedes-Benz SL550 Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 2009 Mercedes-Benz SL550
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2009 Mercedes-Benz SL550 ProblemsCamshaft Adjuster Solenoid Failure
The camshaft adjuster solenoid (which is related to the variable valve timing system) may fail or timing chain/balance shaft components may wear, resulting in illumination of the Check Engine Light and various drivability issues. Mercedes-Benz has released a service bulletin outlining specific repair instructions depending on fault codes stored.
A vibration felt through the center floor of the vehicle can be caused by driveshaft flex discs, which crack and shred, causing excessive driveshaft movement. Not repairing these can cause damage to the driveshaft center support bearing, or, in the worst case scenario, damage to the transmission or differential.
Front thrust arm and control arm bushings can crack and sometimes tear completely. If this is not repaired quickly, damage to the front subframe unit will occur, which is very expensive to repair. Updated control arms (that prevent damage to the subframe when the bushings wear out) are available.
2009 Mercedes-Benz SL550 QuestionsRadio shuts off and on repeatedly (2 answers)
Just bought a very clean SL550 with only 10,000 miles. After 4 days the right tail light (not brake light) went out then the radio started turning on and off then on again...every 45 seconds or so. The dealer told me that BOTH keys fobs had dead batteries in them and the new batteries are still o...
Only on cold days (under 10F) - the ABC will totally fail, dash goes RED, tells me to pull over immediately, squishy ride, etc. Once its above 20F or so it's fine. Happens every winter.