Trouble after fitting front downpipe/ cat on my 2001 astra 1.8 coupe.
had my egr valve blocked off for the last few months,running ok.
fitted a new egr valve and the front pipe but the yellow light on the dash comes on with the new egr valve but not the old one .
is there something im missing.
checked the wiring at the egr and the lamda but looks ok.
Anyone had the same bother. help would be great,