I hve this code p0340 in my bmw x5 8 ciinders

codes p 0171 and 174 refer ti system too lean
codes p 0338,340,365 refers to crank. and can shaft position sensors
code p1338 again is camshaft position sensor
code p1315 again is camshaft position sensor
too lean can be from fuel pump pressure too low
and position sensors can be wiring , connections sensors.
Involved in all these , one of the possible causes is the ECM
IF it is possible get a serviceable replacement ECM unit and substitute it first as there is no point in replacing all the rest if the ECM is faulty
could be water in the connections , corrosion etc
it is always suspect when so many different codes suddenly appear at the same time

for better result download the pdf file
2006 HYUNDAI SONATA SERVICE REPAIR MANUAL DOWNLOAD

Have a shop do the proper testing

• Disconnect the battery. And recheck , how's the plug ?

Where is the camshafts on BMW z3 1997

DTC P0340 - Camshaft Position Sensor Circuit Malfunction
This indicates that a problem was detected in the camshaft position sensor circuit. Since it says circuit, that means the problem could lie in any part of the circuit - the sensor itself, the wiring, or the PCM. Don't just replace the CPS (camshaft position sensor) and think that will definitely fix it.

Symptoms can include:
Hard starting or no start
Rough running / misfiring
Loss of engine power

A code P0340 could mean one or more of the following has happened:
a wire or connector in the circuit could be grounded/shorted/broken
the camshaft position sensor may have failed
the PCM may have failed
there exists an open circuit
the crankshaft position sensor may have failed

Possible Solutions: With a P0340 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:
Visually inspect all the wiring and connectors in the circuit
Check for continuity in the circuit wiring
Check the operation (voltage) of the camshaft position sensor
Replace the camshaft position sensor as required
Check the crankshaft position circuit as well
Replace circuit wiring and/or connectors as required
Diagnose/replace the PCM as required


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• There are two Camshaft position sensors. The one this is for is the one by the oil dipstick on the LH side of the engine. If you replaced the other you need to replace this one as well. Both are recommended, in other words when changing one it is recommended to change the other as well.
• If you have any further questions or comments please feel free to ask and thank you for using FixYa.

• That being said I sat in a chat and waited for a response from you for 12 minutes. I hope this answers your question.

Regards, Tony

I have a 1999 BMW 740 il My SES light came on so I hooked up my OBD code reader p0340 - Camshaft Position Sensor Circuit Malfunction is what came up. so I went to the BMW parts department and bought the Camshaft Position Sensor.
I Replaced the with the new. My SES light was still on so I hooked up the OBD reader again hoping it may reset my SES light but it didn't what did happen is the OBD reader came up with the same code (p0340 - Camshaft Position Sensor Circuit Malfunction) witch is what I just replaced. now I'm at a loss. I'm not sure how to reset my SES light and if I just replaced the Camshaft Position Sensor why dose it the OBD code p0340 still come up. Any suggestions?

may be time for new spark plugs