Idler gear wear
M2732005–2007 cars inside specific engine serial rangesCheck engine light with a camshaft correlation code — the V8 version of the M272 balance shaft fault.
Same root cause as the M272 balance shaft gear: a sintered gear with inadequate wear characteristics in early production. Same engine-out repair. Confirm the engine serial before committing to parts.
Codes a scan would show: P0016, P0017, P0018, P0019
Parts this needs
Checked against mercedesmedic.com

