Ok... So the GTO failed the MOT on emissions...and I Guessed the course of action to remedy this was replace the o2 sensor.. Now having looked, I can only find one after the cat about 1/3rd way down the exhaust..Now I'm not sure if I'm right but arn't there meant to be 2-4 up in the engine bay 1-2 for each bank...as I can't find them anywhere..I even have 2nd engine stripped down and can't find where they would bolt in to the exhausts on that either..

My GTO is H(90) JDM Import

If anyone can put on the right path would be greatful...

P.s Is there anything else other than the sensor that would help the car fail the emissions test..


Cheers

Col