cheers for that Ross. i have never had a look at the readings when i am on WOT, however i am aware that those turbo timers and their a/f readings are not exactly accurate since its not reading off a wide band o2 sensor.

is there a method to check if an o2 sensor is still working fine? i have noticed my fuel economy has become worse of late, and since i have never seen these kinds of erratic readings on the a/f meter before i am still suspecting the o2 sensor may be faulty..