Cam Sensor replaced - still getting check engine lamp

my engine light came on for my 1998 328i, check showed a code 65 which reads "camshaft position sensor" i had that replaced, went back to the shop... they turned the light off just to come right back on after a few minutes. does anyone know a list of things i can have checked and how to check them without paying $100 an hour for the shops to do it for me... any help greatly appreciated thank you

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This post was auto-generated based upon a question asked on our tech article page here: Pelican Technical Article: BMW Camshaft Position Sensor Replacement

[Wayne 962]

Okay, so we know that the cam sensor itself is not the problem. There can be a few other things to check. The cam sensor gets its reading from a metal plate inside the top of the cylinder head that spins past the sensor. You can check this to make sure that it's not coated with some sludge, or broken, etc. See the cylinder head gasket replacement article for pictures of this. You should also check the wiring from the sensor to the DME. The sensor may be replaced, but the wires that the sensor plugs into may be corroded or not making full contact. Trace them from the harness in the engine compartment back to the pins on the DME. If all of this checks out, then there might be an internal problem with the DME. Also check the connector on the DME to make sure the contacts are bright and shiny.

- Wayne