Question about Mitsubishi Lancer

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I've got a Mitsubishi 2006 4G69 2.4L lancer. Very recently while starting for work early morning, the car suddenly lost power (did not switch off) after a couple of km's and would not let me rev beyond 2500-3000 rpm. I switched it off and back on again and still had the same problem it worked fine after 10-15 mins of rest. Happened 3 times till now. Not sure what to change very confused. The code P2138 came up everytime it happened. Please advice

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  • fareed83 Dec 28, 2010

    Thanks will see what I can do. Also like I said the check engine light came up and went off again everytime for the 2 times that happened and it does work fine now (been almost a week though not sure when this might happen again). Any chance of a loose wire? ALso where about is this located. Am also getting another set of codes as well. P0170, P0125, P0130. thanks

  • fareed83 Dec 29, 2010

    With regards to the P2138, If there are loose contacts where do I look for one?? and if its corroded and needed to be replaced what are these sensors called?

  • fareed83 Dec 29, 2010

    Do i have to remove the sensor and check it or jus check the cable outside the sensor? Also if these are corroded what do I do? Do i need to replace the sensor? If so what are these generally called and how many sensors are there in it?? Thanks for the help and patience

  • fareed83 Dec 29, 2010

    When you say the connector, you meant the set of wires with a plug at the washer tank end (as per the image shown) is it?? thanks

  • fareed83 Dec 29, 2010

    Thanks Mate.. Great Help.. Happy New Year to you and your family.

  • fareed83 Dec 29, 2010

    Great Advice and very helpful guidance



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Hello Fareed.

The code that is setting is accelerator pedal position sensor failure.
When this code sets it does a "failsafe" to prevent it from going full throttle.

TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)

  • Accelerator pedal position sensor failed or maladjusted.
  • Open or shorted accelerator pedal position sensor circuit, or connector damage.
  • ECM failed.
  • PCM failed.

There are several required special tools for this repair. The average handy man usually won't have these available.

MB991958: Scan Tool (MUT-III Sub Assembly)

MB991824: V.C.I.

MB991827: USB Cable

MB991911: Main Harness B

I would highly suggest you take it to a mechanic capable of doing this repair for you.

Thank you for using FixYa.


Posted on Dec 28, 2010

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  • FUBAR Dec 28, 2010

    Loose wire? Possibly. Also water inside it or corroded terminals. My experience has been the sensor itself internally.

    DTC P0125: Insufficient Coolant Temperature for Closed Loop Fuel Control
    This is probably a stuck open thermostat. Engine running too cold.

    PO130: front oxygen sensor heater circuit.
    Could be a fuse for the circuit but it's usually the sensor itself bad.

    PO170 ???? Not listed for this model.

  • FUBAR Dec 29, 2010

    They are called accelerator pedal position sensor.
    Look for loose or corroded connections on the sensor itself.
    It's mounted under the hood. Here is a location diagram for you.

  • FUBAR Dec 29, 2010

    I would recommend you replace it.
    Buy a new one and you will then see what it is you need to replace.
    If you do see corrosion when you pull the connector you may need a new connector for it as well.

    The sensor is called......Accelerator pedal position sensor

  • FUBAR Dec 29, 2010

    Yes Fareed, that is correct.

  • FUBAR Dec 29, 2010

    You are quite welcome.
    Thank you for using Fixya.

  • FUBAR Dec 29, 2010

    Thank you for the rating !
    Best of the New Year to you Fareed.



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