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  1. #1
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    1.6 HDI fault P0238 Turbocharger Boost Sensor A Circuit High

    Hope someone can help me out here, when im driving and accelerate the car pulls well then all of a sudden it stops and the light comes up on the dash. The car never has the same power after this, it feels restricted. It normaly feels better after i stop and restart the engine. The fault code is
    ''P0238 turbocharger boost sensor A circuit high'' The car was remapped over a year ago and the DPF has also been removed.
    I have changed the 'turbo boost sensor' and turbo electrovalve. Im completly stuck and just cant aford to keep throwing money at the car.
    I really really need some help!!!
    Its the 1.6hdi 110

    Thanks

  2. #2
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    Re: 1.6 HDI fault P0238 Turbocharger Boost Sensor A Circuit

    Sounds like all that's left is the turbo itself, but start with the most simple possibility - sticking VNT vanes. If you can reach, disconnect the actuator arm at the turbo and see if you can operate the vanes by hand. IIRC the turbo is on the front of these engines ?

  3. #3
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    Re: 1.6 HDI fault P0238 Turbocharger Boost Sensor A Circuit

    i take it that is the rod that is behind the oil pipe? i can easily move that by pressing down on it with a screw driver. Am i on the rite lines there? I tryed using that innotec turbo cleaner, that made no diffrence. Anything else i can do?

  4. #4
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    Re: 1.6 HDI fault P0238 Turbocharger Boost Sensor A Circuit

    yeah, that's the rod mate. Click here to enlarge

    sorry to go off topic.. how long have you had the DPF removed and have you had any other problems? i plan on getting mine done. Click here to enlarge

    do you know how much boost the turbo is making? with the DPF removed, surely the turbo will spool up much quicker and could be going over the 2.5bar map sensor??

    i long shot? lol
    Resident idiot! Click here to enlarge

    Peugeot 207 GT 1.6HDi 110 FAP.
    Click here to enlarge
    Click here to see my 207 progress thread.
    Powered By RS Tuning.

  5. #5
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    Re: 1.6 HDI fault P0238 Turbocharger Boost Sensor A Circuit

    Iv had the dpf removed a good couple of months now, not had any other problems other thatn what iv said. No i dont know what boost its making, how can i find out? Is there anyway to control what boost it makes?
    I really need some advice!!!

    Cheers

  6. #6
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    Re: 1.6 HDI fault P0238 Turbocharger Boost Sensor A Circuit

    only way to find out what the boost pressure is is to install a boost guage. Click here to enlarge

    and as the boost is electronically controlled, the only way to adjust it is via a remap.
    Resident idiot! Click here to enlarge

    Peugeot 207 GT 1.6HDi 110 FAP.
    Click here to enlarge
    Click here to see my 207 progress thread.
    Powered By RS Tuning.

  7. #7
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    Re: 1.6 HDI fault P0238 Turbocharger Boost Sensor A Circuit

    so what your saying is its gona cost hundreds of pounds to sort? Is there not another way round it?

  8. #8
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    Re: 1.6 HDI fault P0238 Turbocharger Boost Sensor A Circuit

    there's a couple of other threads today with more info in about this problem. you can either get the map turned down a tad or find a 3bar map sensor.

    look at the most recent few threads and it's got ALOT of info regarding this problem. Click here to enlarge
    Resident idiot! Click here to enlarge

    Peugeot 207 GT 1.6HDi 110 FAP.
    Click here to enlarge
    Click here to see my 207 progress thread.
    Powered By RS Tuning.

  9. #9
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    Re: 1.6 HDI fault P0238 Turbocharger Boost Sensor A Circuit

    Well, it could cost hundreds of pounds if you start doing what most people / main dealers do, i.e. throw new parts at it until you do (or don't) solve the problem. It's worth following a systematic approach, which needn't cost much at all.
    So, you think the VNT mechanism is working ok, and you've fitted new MAP sensor and boost solenoid. That ought to eliminate those three components.
    Perhaps you could take it back to the mapper and ask what they set the boost at.
    Also, worth finding out which value MAP sensor you have as standard. Looking at Twed's suggestion, if your boost is within say 0.5 bar of the sensor value, your boost spikes could be exceeding this value perhaps, and causing limp mode activation.

  10. #10
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    Re: 1.6 HDI fault P0238 Turbocharger Boost Sensor A Circuit

    Is it the thread about the c2? or is there more threads? I cant really get any1 up here to alter the settings for me its a couple hundred miles!!!

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