1998 Volkswagen Cabrio Q&A

1998 Volkswagen Cabrio Question: Code 16990

My Check Engine light is on and the car is throwing the 16990 code. Any suggestions for narrowing down the possible causes. Thanks! -
Answer 1
That code is for the Engine Control Module (ECM) Is that the only code that is stored? -
Comment 1
Sorry I wrote 16990; should have been 17990 (idle adaptation at limit) and that is the only code showing. -
Comment 2
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 2
Often cleaning the throttle body and setting adaption is all that's needed...... -
Comment 1
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. -