Hello,
I am new to this site but wanted to say thanks for the tip. My check engine light was on 2 days after I had taken it in to be fixed. The mechanic had repaired some vacuum hoses on 3 lines. After I drove the car for a day it was back on w/the same error code (P1582). I had seen your post and asked him to clean this part and he must have not taken my girly advise. My boyfriend did as you said and the light has been off ever since. I am the new owner of a 2002 Red Cabrio and loving it, even if it does come with a few repairs. Thanks Again!

 

Sorry its an old thread but no one has given an answer?

VAG Error Code: 17990
EOBD II Error Code: P1582

Fault Location:
Idle speed adaptation - limit reached

Possible Cause:
Malfunction indicator lamp (MIL) Triggered on second occurrence.
Intake/exhaust leak.
Secondary air injection (AIR) system.
Fuel pressure/pump.
Injector(s).
Evaporative emission (EVAP) canister purge valve.

As taken from my Free EOBD II Error Codes software