The only tech service bulletins (TSB) I show released are for the fuel cap and the charcoal canister. Neither of which should impeed performance. In theory, antthing that triggers your check engine light should be logged in memory. When you had the computer scanned, was the scanner able to reset the CEL or not? The fuel cap may be emitting vapors detected by a sensor, but not log a code. You can your local Toyota dealer and see if this is a warranty issue. Wish I could tell you more.
Tuesday, December 16th, 2008 AT 5:48 PM