MOT fail

[MNK]

So it failed on "Exhaust emissions Lambda reading after 2nd fast idle outside specified limits"

Expected range 0.97-1.03, reading was 1.046

So the tech asked how often I use it... noted I do low annual mileage (and when I do drive it, it's mostly city driving), so suggested I go drive it around hard and take it back tomorrow.

I've got a Supersprint cat-back system with x-pipe (no centre exhaust)... I take it this can't make any difference on this reading? It passed last year fine with the same exhaust!

[A20LEE]

Take the MOT testers advice. Make sure the car is hot when tested and it will pass

[rs6_sid]

Mine did that same he said it was upto temp which he was right the water was but the oil must have old been 60c I could tell it was going to fail it wasn't hot and the rear cats take some heating up , quick run up the road and it flew through he said it was like a different car

[MNK]

Yep did a bit of single-digit mpg driving, took it back, passed fine! Thanks