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-Front Cylinders also can have Valve Issues, perhaps more common than cylinder scoring.
-Video to replace camshaft position sensors: • Change Camshaft Positi...
-Video about Airmatic DIY Diagnostics and Fixes • Mercedes Airmatic Susp...
-Forum posting about valve issues and cylinder scoring: mbworld.org/forums/gl-class-x...
Some common issues on the M278 and M157 engine as reported by forum users on mbworld and across facebook.