MOT emission failure

[ellsbells]

just failed the emissions test today, it passed the fast idle with no problems but the on tick over, it was over 2% when the car cold starts though it has a rough idle at about 1200rpm until its up to temp, would giving the car a boot before i take it back to the test centre clear anything out of the system before its retest

 

[montana]

Yes - its advisable to never do an emissions test on a car that isnt fully up to temp

 

[ellsbells]

went back in today after work and still failed the idle test, dropped from over 2% to 1.4% still far to high, gonna be costly this i can see it coming, diagnostic bloke at garage is gonna plug it in to fault find, hopefully its not the cat