Has anybody here experienced a MKIII Superb failing its MOT on emissions (co2)?

My car has only done 40k and I haven't noticed any issues with the car since having the Evap Canister replaced .

I'm not sure if using Tesco Momentum 99 has caused it to run rich. I'm quite concerned as it's coming up to 4 years old next month and I thought these cars were reliable.
It sailed through everything else, but despite trying Wynns Emissions Reducer and Cataclean, it still fails to pass.

Any thoughts would be welcomed.

 

Tesco Momentum 99 will not cause it to run rich. Check if anything has beed disturbed when the Evap Canister was replaced. A dislodged breather pipe etc would mess the emissions up.

 

Co2 isn't measured though on the MOT. 

Edited 27 August, 20205 yr by bigjohn

What are the CO figures on the fail sheet? Is it failing by a lot or a little, in other words.

Have you been doing a lot of short runs, and not much long fast stuff?

On 27/08/2020 at 15:44, Wino said:

What are the CO figures on the fail sheet? Is it failing by a lot or a little, in other words.

Have you been doing a lot of short runs, and not much long fast stuff?

CO was =< 0.3% 0.47% (whatever that means).
I've been doing a fair bit of mixed driving and gave it a good run over the weekend.

Drove the car from a full tank empty over 2 days last weekend.

 

Took it to Trans City Skoda yesterday in Walthamstow and they said the throttle body needed adjusting.

It's now reading CO =< 0.2%   0.03%.
It's all good now and passed through with ease

Something to look out for.

 

Thanks guys.

Edited 28 August, 20205 yr by Ronskin
slight modification to the grammar

Good result, hopefully that didn't cost you too much?

1 hour ago, Wino said:

Good result, hopefully that didn't cost you too much?

 

Cost about £190.00.

Much cheaper than getting another car. ☺️
I would struggle to replace it as nothing out there has the load lugging capacity with the performance, gadgets/features and luxury at that price.