Originally Posted by CossieRob
Cheers guys
Stu could you explain how the engine being too cool or the fans being on would affect this cos i haven't got a clue about how these sensors work? Could they be tested in anyway to check that its working?
A performance catalyst does not work fully until its at a very serious temperature. This temperature is rarely attained without 10miles driving.
If the engine is tested below operating temperature (Illegal but hey..) the Vehicle may not be locked fully into closed loop operation as happens around 88-92 degrees C in most management programs.
The test shouldnt be done with fans running for reasons stated earlier...