Hello, Cam sensor part # 12 141 742 185, oring part # 12 141 748 398. P0340 is a very common code. 99% of the time it is caused by a bad sensor. The code will turn on the check engine light after two drive cycles, It is compared in relation to the crankshaft sensor signal. The code will set if cam signal is missing or incorrect. Cam sensor is a hall effect switch that generates a digital signal to the DME that is used to determine camshaft position.
If this information was helpful please hit accept. Thanks, Nick
ASE Certified Technician
Over 25 years of experience in automotive computer systems. ASE L1 Cerfification