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Why is there no acceleration from my BMW 5 Series?

I have a 2006 BMW 525i and there's a problem with the acceleration. The car idles fine with no noticeable odd noises coming from the engine. When I press on the accelerator the revs very slowly climb to around 3-4000 rpm. There is virtually no power in acceleration and it seems like it is in "limp mode". There are no warning lights and no error codes from the ODB.

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Without any warning lights and no fault code, this is difficult to identify, so we would check the following.

Air filter - blocked/dirty
Fuel filter - has it been changed in accordance with service schedule
Check for any air /vacuum leaks
Spark Plugs - have they ever been checked /changed
Also if you have the N52 engine then it could be the CMP ( camshaft position ) oil pressure valve stuck/sticking (a known fault) This valve can be removed and cleaned.
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