Series 1 & 2 exhaust

[snuglez]

Just wondering if series 1 and 2 exhausts are the same as i replaced my series 2 exhaust with a series 1 today and realised the resonators are a little different. Later on the engine light came on im guessing maybe because the exhaust was maybe sitting for a little and the o2 sensors have been tricked .

 

[Not_An_Abba_Fan]

No, basically the same. Shouldn't affect anything to make the CEL come on. You haven't left an O2 sensor plug off or not pushed it in all the way?