Question about 1995 Ford Windstar

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1995 Windstar OBD II showing codes PO340, PO171, and PO174

We are having problem with the Windstar. We are not able to run over 20miles per hour, and at 2100 RPM the idle keep going up but the car lossstrength it is like the transmission goes to neutral. The first testshowed codes PO402, PO732, PO733, PO171, and PO174 so I replacedDPFE/EGR Valve Presure Sensor, and Neutral Safety Switch I went to thegarage, and the mechanic told me that the transmission is fried so justto verify I bought the OBD II to run the diagnostic tests, now the testis showing codes PO340 (Camshaft Position Sensor A - Bank 1 CircuitMalfuntion) PO171 (System to Lean, Bank 1), and PO174 (System to Lean,Bank 2). I will be looking for leaks but in the mean time I would liketo know what are the symptoms of a bad Camshaft Position Sensor. Pleasereply to:

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  • Andy7777 Jan 18, 2009

    How can be the fuel pressure when the idle keep going up, and I don't
    have any problem in 2nd, neither in 1st gear only in drive gear? I
    cleared the codes, and after a driving test re-checked and now none codes.

  • Andy7777 Jan 19, 2009

    I cleared the codes and recheck after a drive test, and no error codes this time. I still don't understant the relation between a fuel pressure problem with the idle (RPM) going up after 2100 RPM, and I don't have that problem in P. 2nd, 1st, neither neutral only in drive gear.



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With those codes, the first place I would check is the fuel pressure. Also check the fuel filter and replace it if you haven't already. Then clear codes and recheck. Even if your fuel pressure is with in range it still may not push enough fuel to operate your vehicle.

Posted on Jan 15, 2009

  • Rich Palmer Jan 18, 2009

    What you may be experiencing is once you go into drive the fuel pressure drops as the rpm drops off and the convertor in the transmission tries to lock up. As I said, if you have low fuel pressure or on the low side of the range you may not be getting the volume to properly operate the engine. Also check your fuel pressure regulator for a leak either of fuel or vacuum.

    Hope this helps.


    RPM Northwest



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Symptoms of a faulty Camshaft Position Sensor can include hard starting (or no starting), rough running/misfiring and/or loss of power.

Code 340 COULD be caused solely by a faulty Camshaft Position Sensor. However, this code refers to the entire circuit. So, replacing the sensor may not fix the issue. The problem could lie in any part of the circuit - the sensor itself, the wiring, or the PCM.

Codes 171 and 174 typically appear together. They are caused by the 02 sensors reading too much air (lean) in the exhaust. In most cases, simply cleaning the MAF sensor does the trick. I typically take it off and spray it with electronics or brake cleaner. Just make sure it dries before reinstalling. If this doesn't eliminate the codes, inspect all vacuum and PCV hoses, check for a dirty fuel filter and ensure the furl pressure is within limits.

For clarification, the first trip to the shop your car showed codes 402, 732, 733, 171 and 174. After changing the DPFE/EGR, did ALL those codes go away and now only codes 340, 171 and 174 exist? Or do you have the second set of codes in addition to the first codes?

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