Question about BMW Z3

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On a 2000 bmw z3 with a 2.5 l 6 cyl, i have hesitation and stalling from a stop. service engine soon light is on. seems to lack in a little power also. it has codes po340, p1188, p1189, and p1189 showing. i can clear the codes and code p0340 wiil come back in , in a short period of time. what am i going to be looking for

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  • jeffmiller90 Apr 23, 2010

    where exactly is the CPS SENSOR A or bank 1 sensor located?

  • jeffmiller90 Apr 23, 2010

    thank you for all your help and info



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Several choice and faults here; check this info...

P0340 OBD-II Trouble CodeTechnical Description

Camshaft Position Sensor Circuit Malfunction

What does that mean?
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

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

A faulty coolant sensor can cause rough idling, too.
Have you cleaned the ICV?
Vac leak?

Try disconnecting the TPS for idle results as it's the cheapest way of troubleshooting; no meter necessary.
There's also the AIT ( air intake temp sensor) not something found to be a common component fault, so I would try that after all else before buying anything new.

I know the code is supposed to narrow down the possibilities, but it's best to check everything that can cause trouble of this nature.

P1188 & P1189 OBD-II Trouble CodeTechnical Description
P1188 = O2 Sensor Circuit Slow Response in Rich Control Range (Bank 1 Sensor 1)
P1189 = O2 Sensor Circuit Slow Response in Lean Control Range (Bank 1 Sensor 2)

Check all fuses, circuit(s) and connections to the upstream O2 sensors. its possible that you need replace it. Also clean MAF.

Will your code reader monitor engine temp? Check ECT sensor and circuit for the open loop issue.

Hope this help. Good luck.

Posted on Apr 23, 2010

  • ZJ Limited
    ZJ Limited Apr 23, 2010

    * Bank 1 is the manifold sensors. Sensor 1 should be the one closest to
    the front of the car.
    * Bank 2 are post cat sensors, same as before for location.

    Bank 1 means that it involves cylinders 1, 2, 3.
    Precat means that it is before the cats...

    Make sure its a bad o2 sensor and not a
    dirty maf causing too rich/too lean conditions.

    This link can be interesting:

    Good luck.

  • ZJ Limited
    ZJ Limited Apr 23, 2010

    For Camshaft Position Sensor check this procedure like reference guide: Camshaft Position Sensor

    Good luck.



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