180pete

Hi guy’s, my first post, let’s see if I can get this right, if I bugger it up and get it wrong it won’t be a surprise, to me anyway!
Question: can a slightly leaking head gasket cause emissions to be high, I fitted a stainless steel sport cat from Rimmer Bros last year, I’ve done 9,000 miles with it and this year it just failed (0.420)
Car is also due a service
I thought after shelling out £500 I’d be ok for a while, I’m getting on average 390 / 430 miles per tank of E5, what’s your thoughts.