Rob350 Posted October 22, 2016 Share Posted October 22, 2016 Got a p0420 bank 1 or 2 under efficiency threshold, iv got standard cats and y pipe with k1 mid and back, Iv done some reading some people say it could be o2 sensor, others say defo the cat, also seen 1 guy say he had put some redex type stuff in had a blast and it hasn't come back in 6weeks. Iv read it won't hurt my engine I leave it for a bit. It only comes on when staying at a constant rpm for 5 to 10mins like on a motorway Someone flogging cats for 70 squids on here I'm tempted to buy Any help appreciated chaps Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted October 22, 2016 Share Posted October 22, 2016 It is bank 1: Try an O2 simulator to space out the rear sensor from the flow. Might save you a few bob. Quote Link to comment Share on other sites More sharing options...
Rob350 Posted October 22, 2016 Author Share Posted October 22, 2016 The exhaust was on the car when i bought it 2 months ago and the code only came on last week, so i assumed the spacers were already on Quote Link to comment Share on other sites More sharing options...
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