My Check Engine light is on and the car is throwing the 16990 code. Any suggestions for narrowing down the possible causes. Thanks!
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1998 Volkswagen Cabrio Question: Code 16990
Answer #1Bret Bodas from RepairPal Test Shop, February 26, 2009, 13:12Master
That code is for the Engine Control Module (ECM) Is that the only code that is stored?
ReplyJohn-in-CT, February 26, 2009, 16:09Enthusiast
Sorry I wrote 16990; should have been 17990 (idle adaptation at limit) and that is the only code showing.
ReplyBret Bodas, February 26, 2009, 16:17Master
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.
Answer #2spyder March 04, 2009, 13:59Journeyman
Often cleaning the throttle body and setting adaption is all that's needed......
ReplyJohn-in-CT, March 04, 2009, 15:31Enthusiast
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.