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1998 Volkswagen Cabrio Question: Code 16990

 

Question

John-in-CT, Gasoline, Stamford, CT, February 26, 2009, 13:03
 Enthusiast

My Check Engine light is on and the car is throwing the 16990 code. Any suggestions for narrowing down the possible causes. Thanks!

2 Answers
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  • Answer #1

    Bret Bodas from RepairPal Test Shop, February 26, 2009, 13:12
     Master

    That code is for the Engine Control Module (ECM) Is that the only code that is stored?

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    John-in-CT, February 26, 2009, 16:09
     Enthusiast

    Sorry I wrote 16990; should have been 17990 (idle adaptation at limit) and that is the only code showing.

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    Bret Bodas, February 26, 2009, 16:17
     Master

    This is the code info: 17990 P1582 Idle Adaptation at Limit

    The idle control system on your car compensates to keep the engine idling properly, when it has to over compensate, it sets a code. Vacuum leaks are a main cause, but it could also be the result of one of the sensors in the engine management system. Perform a visual check of the vacuum lines and intake hoses and look for loose clamps, disconnected hoses etc.

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  • Answer #2

    spyder March 04, 2009, 13:59
     Journeyman

    Often cleaning the throttle body and setting adaption is all that's needed......

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    John-in-CT, March 04, 2009, 15:31
     Enthusiast

    Thanks for the answers. Hopefully it will be warm enough to work on the car this weekend (I think I have the only house in CT without a garage!). I am praying it's just a dirty throttle body. I don't see any vacuum leaks, etc.

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