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Thread: Limp mode

  1. #1
    Regular Member dan1983's Avatar
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    Default Limp mode

    Hi could someone tell me what this means and what happens.
    Thanks

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    Regular Member m8internet's Avatar
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    The engine management system (EMS) has lost communication with one or more sensors
    This normally means that sensor has failed and requires replacement
    Such sensors are either required or essential for the engine to run correctly
    However, the EMS can run in limp mode without the signals from the sensor and the EMS light will come on
    Typically the revs are limited to prevent engine damage
    Book the car in for diagnosis and repair as soon as possible

  3. #3
    Regular Member dan1983's Avatar
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    cheers

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    Regular Member vectragsi3.2's Avatar
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    has it happened to you car? could be something to do with the lambda probe if it has!!

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    Regular Member dan1983's Avatar
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    not sure cos it happened quite soon after i bought the car so dont know if im getting the performance i should

  6. #6
    Ex Vec-C Admin / Founder Duncan's Avatar
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    Quote Originally Posted by m8internet View Post
    The engine management system (EMS) has lost communication with one or more sensors
    This normally means that sensor has failed and requires replacement
    It will also happen when a sensors detects a reading out of the expected range and will put the engine into limp mode to protect it i.e. the sensor would still be working perfectly and communicating fully with the EMS. A perfect example being a split boost hose - sensor detects an out of range reading so forces limp mode. Sensor working fine and communicating fully and detecting a physical problem. So it's not only due to a loss of communication/faulty sensor.

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    Vehicle : Vectra C Hatch

    Trim : Exclusive Plus Pack

    Engine : 1.9 CDTi Z19DTH

    Year : 57

    Mileage : 100k+

    Default

    so dont know if im getting the performance i should
    My only experience was in a TD hire car. You know for sure that it's happened - it was like driving a car with a little diesel engine and no turbo! If you are doubtful it sounds more like its just under-performing a bit for some other reason?

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