It makes no difference to the MOT as it is checked at idle and at approx. 2,500rpm.
The EGR valve tends to work on the overrun also the MOT tests CO and HC. The valve reduces NOx outputs.
Therefore as the MOT does not measure NOx there is no way it will fail the emissions test.
Last edited by Eddie Cairns; 19/06/16 09:32 PM.
