Question about 1998 Jaguar XJ8L

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What does Failsafe Engine Mode mean? my manual was stolen

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  • jansolondz Dec 14, 2009

    thanks for the heads up suggestion that I take it to autozone where they read the fault codes and came up with the problem code of P1111. Do you know whata this means? thanks so much for your help. Jan Solondz

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  • Jaguar Master
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Hello! Fail safe mode is when the vehicle's computer detects a serious problem an allows you to "limp" off the road or highway safely.

Fail safe mode on a Jaguar is mainly caused by a dirty and gummed up throttle body. The throttle body on your auto has a protective coating, so you can not use just any cleaner. It requires a throttle body cleaner that states "safe to use with a protective coating". The butterfly valve in the throttle body will actually "stick out". This causes fail safe mode to kick in reducing the amount of power your engine can produce.

Also check the plugs on your ECM (computer) and make sure they are all seated properly.


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Posted on Dec 13, 2009

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  • Master
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Failsafe engine mode on a 2000 jaguar s type is caused by a stopped up throttle body. Jaguar says not to clean the throttle body since it has a protective coating to help keep deposits from accumulating. You can clean the throttle body as long as you use ONLY throttle body cleaner that states it is safe to use with a protective coating. The butterfly valve in the throttle body will actually stick not allowing air to flow into the manifold causing failsafe engine mode to kick in reducing the amount of power your engine will produce. To solve the issue just clean out your throttle body, it will cost you around $5 dollars and take 1 hour of your time.

Posted on Dec 13, 2009

  • INDIRA KUMAR
    INDIRA KUMAR Dec 13, 2009

    When the fail safe light comes on the
    PCM has detected a fault and goes into a restricted mode to prevent
    damage to the engine and transmission. It can be a brake switch or
    possibly a problem with the electronic throttle. You will need to have
    the fault codes read from the PCM with a compatible scan tool. If you
    do not want to go to the dealer you can try your local parts store, autozone
    or pepboys as they will usually scan for codes at no charge. Once you
    have the code numbers let me know what they are so I can assist you
    with the diagnosis and repair.




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