Troubleshooting
For my condition, P0015 code is Bank 1 Position "B" for the Camshaft Position Sensor. (Not to be confused with the single Crankshaft Position Sensor which detects the flywheel and crankshaft position). Bank 1 is passenger side of engine, and position "B" is the exhaust cam. So I needed to replace the solenoid on the exhaust cam on the passenger's side of the engine. The top one is the Intake and the bottom is the Exhaust. As a preventive measure, I replaced both solenoids. The M272 and M273 engines have four camshaft positions sensors and solenoids, so other CEL similar codes may be p0011, p0012, and P0014.
Found a STAR diagnostic screen which indicates Solenoid Magnet replacement is part# A2720510177 as opposed to doing the hall-effect sensor replacement for M272 engine (STAR also indicates not to replace the hall-effect sensor). My S550 is a 2007 5,461 cc (5.461 L; 333.3 cu in) V8 (M273) engine. However, the M272 and M273 are modular cousins, and the M272 is just the 6 cylinder version. These parts and instructions should compatible between all MB platforms that use these two engines.
I got new MB camshaft solenoid magnets from FCPEuro for about $25 each. The Solenoid Magnet replacement is part# A2720510177. (See Picture) Evidently, this is an upgrade part from original A2720510 0 77 which proves to be a bit wonky over time.
