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hello.

I have a 2009 Passat with the 2.0 TDI engine ( I think the motor code is CBAB). Unfortunately, the car suffered from a bad hex key in the oil pump. The hex key has now been replaced but the car now suffers from a knocking sound. The sound is there when you start the car (7-800 rpm.), but as soon as you rev the engine above 1000 rpm the sound disappears. Any suggestion on what this might be ?.

I have also tried to scan the engine for any fault codes, I get a code that says “ 01651 – Cylinder 3 Glow Plug Circuit – Active/static.”. This code was not there before I change the hex key in the oil pump. Does anyone think that this fault code can have anything to do with the sound?
 
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