Q: How many camshaft position sensor are on my 2012 BMW 328I 2.0 turbo

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car has power, fuel, and good compression. engine turns over but will not start. ran a diagnostics code and got a code "P052b" cold start "a" camshaft position timing over-retarded bank 1. googled it and came up with this list of possible causes:

Camshaft timing incorrectly set, Faulty Crankshaft position sensor, Faulty Camshaft position sensor, Faulty Intake valve timing control solenoid valve, Faulty Intake valve timing intermediate lock control solenoid valve, Accumulation of debris to the signal pick-up portion of the camshaft, Foreign matter caught in the oil groove for intake valve timing control.

Figured id try replacing the camshaft position sensors and the crankshaft sesnor. Any advice? Also, how many camshaft position sensors would this car have?

My car has 74000 miles.
My car has an automatic transmission.

There are two camshaft position sensors on your model. Both position sensors, as well as the crankshaft position sensor, should be tested using an appropriate scan tool or automotive scope to determine if they are functioning. Due to the availability of scan tools and other diagnostic techniques, it is almost never necessary to replace parts on a "trial and error" basis. Also, it is very costly and wasteful to proceed that way. The best thing to do is have the vehicle fault actually diagnosed (pinpointed) and then replace only those parts which are confirmed by testing to be faulty. In your circumstance, the best way to proceed is to request a check engine light diagnostic. A certified mechanic from YourMechanic would use a code scanner to retrieve the specific diagnostic trouble code(s) from your car’s PCM that have caused the check engine light to illuminate. Using those codes, the appropriate individual vehicle components or sub-systems (often a sensor, circuit, and the like) are then carefully tested, based on specifications set forth in your car’s Factory Service Manual, to pinpoint the cause of the fault or the reason why the check engine light has illuminated. Once the faulty part or component is identified, it is explained to your satisfaction and the mechanic will let you know of the cost to repair. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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