Older Pre Cat Cars and MOT

[as400]

Do older cars that never had a CAT fitted struggle with MOT emissions come MOT time?...or do they get given some form of special dispensation/leniency?

[droopsnoot]

It depends on the year. Up to somewhere around 1975, it's a check for visible smoke, my 1976 Vauxhall has to have an emissions test but it's less stringent than a later car.

Details here: https://www.gov.uk/guidance/mot-inspection-manual-...

[Sebring440]

Ask your question here:

https://www.pistonheads.com/gassing/topic.asp?h=0&...

[FilH]

Had my 1990 Sierra MOT'd yesterday.

He selected pre cat on the test machine, and probed the exhaust for an idle only emissions test.



Passed with CO of 2.31 % allowed 3.5
And HC of 88 ppm allowed 1200!

Post cat carshave a lot lower allowable amounts. CO is 0.3% or 0.5 % ones at idle the other 2000 something + rpms