Can K&N filter affect emissions on 2L 16V??

[Niges16V 0]

Help needed Please!

 

Failed MoT a couple of weeks back on CO emissions so did the full on recon cyl head change with necessary gaskets & seals. Just put it in again today feeling very confident as it is running very smooth, but failed again. It was OK at idle but is giving 0.47% CO @ 2700rpm when pass is 0.3%.

 

It had a new Cat last year for MoT, the timing is spot on, new injector seals, can't think what else it can be unless the hi flow filter has an affect.

 

Any tips would be appreciated as my C is left in the garage for the mechanic to clock a few hours against!!

[Walesy 0]

the pannel filter shouldnt mean that you fail emmisions.....lambda probe?

[h100vw 0]

It's nowt to do with the CAT. You need to have it checked by a VW specialist. Adjust the mixture requires a 1551 or VAG-COM I think.

 

Gavin

[Henny 0]

A dead coolant temp sensor would throw it out by around this much too...