desertsubaru Posted June 17, 2015 Share Posted June 17, 2015 I picked up another free Subaru because of rust issues, it is a 2000 impreza with a 2.2 150 k on engine. It will be strictly an off road beater because of the rust. I had the rear cat cut out because it had rust holes in it and had a straight pipe welded in but now I get a p0420 code. I understand that the code has to do with catalyst but was wondering if it will do any damage to the front cat or engine if I drive it like that. I would also like to know if there is a fix like the spark plug fouler trick that would turn that code off? Quote Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted June 18, 2015 Share Posted June 18, 2015 the ECU does not alter any engine operation parameters at all from that sensor's data. anti-fouler extension might work. I think there is a resister mod that might work too. Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted June 18, 2015 Share Posted June 18, 2015 Won't hurt it. Only needs the front sensor for air/fuel ratio changes. Quote Link to comment Share on other sites More sharing options...
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