Question about Jaguar XJS

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Check engine light

I took it to mechanic he says everything is fine with it, but he does not know the code to reset the engine light. ANY OF U MIGHT KNOW WHAT TO DO?? it is driving me crazy

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  • flyskip Aug 06, 2008

    code indicated need for new mass air sensor. replaced that part but don't know how to turn the engine light off. any help appreciated, i try to keep this car running for my wife. she loves it more than i do!

  • brubakeraj Aug 30, 2008

    Replaced oxygen sensor and need to reset check engine light. Tried disconnecting engine but no luck. Any tips welcome. Thanks,

  • Anonymous Dec 05, 2008

    a.b.s light stays on 51 plate x type 2.5 v6

  • wndjnki Jan 09, 2009

    YEah I have low voltage p1633 , replaced battery now cant reset check light

  • Perdido61 Jan 23, 2009

    Check engine light needs resetting. Help!

  • carlhestad Mar 07, 2009

    I have a 1994 XJS 6.0L V12 and had to jump start after sitting a week and now the check light is on and the code I am getting is FF77. Any assistance would be most appreciated.



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  • 291 Answers

The transmission chain may be broken, it's int front of the engine, it can be rather costly but it's easy to tell

Posted on May 15, 2008


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Took car for diagnostic testing because engine light came on. Autozone said that it may be the cylinders backfiring. Took it to a mechanic he said that it may be a false indication so he reset the light...

i would rather take the mechanics advice , sometimes it does happen that a fault pops up , take it to the mechanic in a week or two to retest . just to be sure

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P0440 is a large evap leak, so it should be pretty obviuos. first check if the vent valve is closing. then check when the purge valve is closed that its not leaking. He needs to COMMAND the vent valve closed and then smoke it. He should be able to command purge and close the vent valve, then turn off the purge and watch the vacuum level to know if its fixed or not.

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P1607 means "powertrain control module (PCM) internal circuit malfunction". According to the factory service manual, a low battery condition can cause this. This code can also pop up after the battery has been jump started.

You need to reset the PCM. To do this, turn the ignition switch off. Remove the No. 13 fuse (7.5Amp) from the passenger's under dash fuse/relay box for at least 10 seconds. Put the fuse back in. That should complete the reset.

Now to check again for the code: turn the ignition switch to on (not start.) Wait 30 seconds. If the check engine light stays OFF, turn the ignition switch off and wait 10 seconds. Turn the ignition switch back to on (not start). Wait 10 seconds. If the check engine light stays OFF, you had an intermittent fault and it has now been reset--everything is fine. If the check engine light comes back on during these checks, have the code that set read out. If the code is P1607 again, then you may have to have the PCM tested at the dealership for an internal fault.

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