Emissons Failure

[Posidrive]

Just failed MOT on emissions but surprised that no error code showing. Any ideas what could cause this?

 

Slightly concerned could be related to not being driven for 8 months

[Ekona]

What were the emissions? 

[Jay84]

Quite possibly a result of not being driven, or the test station not getting it hot enough. If it has sat for a few months, a decent drive will always help. Any advisories for a leak? They can affect the lambda result from pulling in air. It difficult to drive and get hot without an MOT in the first place though. Is it a standard system?

[Daisyduke]

Mine was an exhaust leak

[Sim]

As said above, I always get mine properly hot before an MOT as I run HFCs.

Edited November 27, 2018 by Sim

[Umster]

Swap decats to HFC or stock cats. 

 

Check for faulty gaskets on the exhaust manifold or in the exhaust system. 

 

Try a bottle of cataclean or redex and red line the car a little. Blow the @*!# out the system and get the catalytic convertor back to good condition. 

 

Take a nice long drive and stick in the lowest gear possible before heading into the MOT station.