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Looking for advice on potential MK8 ST purchase

474 Views 4 Replies 3 Participants Last post by  MarkP80
Hi all,

I am going to view a 2018 ST on Saturday with the intention of buying it if all goes well. I have noticed however, it failed an MOT in 2022 for:

Exhaust hydrocarbon content after 2nd fast idle exceeds manufacturer's specified limits ( (a)

Is this anything to worry about? Should I steer clear?

I would really appreciate any advice that you have.

Thank you
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Hi Liam,
Does it have a standard exhaust fitted? and if so did it have a standard exhaust at the time of the MOT?
Lots of owners fit exhausts etc and remove them before selling on.

Obviously a question worth asking at point of sale is how this was resolved, receipts/history etc may help?
Failing on exhaust HC is an unusual one for a relatively new car. At the time that would have indicated a fault with the fuelling system or the cat - the closed loop fuelling ensures the hydrocarbon in the combustion mix is at or near stoichiometric and then the cat converts any remaining traces, so there's none in the exhaust.
Cars usually pass the MoT emissions test by a wide margin for this, so failing would definitely have indicated a fault at the time, I believe. But it to pass on retest indicates that it may well have been fixed.
If it were me, I'd at least be asking the garage to give it a new MoT, so that you get a print-out of the emissions results. Talk to them about it and see what they say.
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Thank you both for your replies.
I have decided to go for it - will be buying a 2 year warranty so all should be ok.
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I have decided to go for it
Thanks for the feedback. Good luck and let us know how you get on with your new car!
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