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  1. #1
    Dan
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    Fault "Electronic thermostat control final stage"


    Does anybody know what to do about this fault? The car (1998 740iL) runs great. Temperatures are normal. Thanks. Sorry to bother you all again but nobody responded... Any Ideas? Juat curious.


  2. #2
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    Re: Fault Electronic thermostat control final stage

    Yup, your thermostat is electronic and is a relatively common problem. It won't affect your driving or engine but it will keep throwing the "check engine" light on ocassionaly. I asked my parts guy at the dealer and he told me this is a very common problem, actually a TSB on it i believe. If you replace the thermpostat it should be fine.

    Ivan
    99 740il

  3. #3
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    Member No: 122793 kgreene is an unknown quantity at this point kgreene's Avatar
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    Re: Fault Electronic thermostat control final stage

    The electronic sensor on my t-stat went bad, causing a bad ground that took out the fuel pump, DME computer and EGS (transmission) computer. Needless to say this became a very expensive repair and caused the engine to not start. Do not delay getting this fixed!Kyle.
    98 740iL
    01 525i

  4. #4
    Dan
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    Thank you very much!!


  5. #5
    Dan
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    Will do.


  6. #6
    Raman Sain
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    Re: Fault Electronic thermostat control final stage

    Is this the thermostat that is on/near the water pump?


  7. #7
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    Yes.

    The tstat with the sensor is attached to the water pump.

    Kyle.
    98 740iL
    01 525i
    Kyle.
    98 740iL
    01 525i

  8. #8
    BigDaddy17
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    V12 thermostat: how-to advice?

    My 2000 750iL is giving an 8b code on my PEAKE tool (electronic thermostat control final stage). When I clear the code, the light comes back the 2nd time I start up thereafter (not the first time, the second. I also get Fd, which apparently refers to the aux fan).
    Anyway, I want to replace the thermostat but I haven't been able to find a write-up on the thermostat for the V12. Has anyone managed to replace the thermostat by itself, without removing the water pump and a lot of other components?

    Thanks for any advice.

    GD

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