Vw Scirocco Mot emmisions fail

[Dewi-asl8m]

I had my MOT today and it failed on the emissions (see sheet attached). My car is a 1.4 tsi twin charged petrol so it never crossed my mind that it might fail on the emissions, its something that I thought would affect diesel cars under the new MOT regulations.
Ive been told it could be a number of things, just hoping its not the Catalytic converter as they are not cheap.

As anyone else had a similar issue and know what is most probably causing this.
Could it be likely that it had the same emmisions last year but the test is stricter under the new regs

Edited by Dewi-asl8m on Saturday 16th June 22:15

[GreenV8S]

Fast idle results look fine, natural idle shows very high CO. There are no HC or lambda readings to go with the failing CO result.

Possibly a faulty upstream lambda sensor causing over-fueling in closed loop and the fast idle test was fast enough to be open loop?

An OBD reader that can show you the fuel trim at idle might confirm that.

[stevieturbo]

it's because they tested it sideways

[Mignon]

Idle speed looks low and it seems the ecu is not going into closed loop mode until the revs are higher which is why it passes the fast idle test. This can mean a MAF or MAP sensor or maybe throttle body is faulty. Google seems to think yours has a MAP sensor. If the cat or lambda sensors were faulty it would also fail fast idle. Have a look at this thread.

https://www.micra.org.uk/threads/failed-mot-on-emi...

[Dewi-asl8m]

Thanks both