jimmy vtec Posted September 10, 2011 Share Posted September 10, 2011 Just installed my japspeed decat pipes and now the engine management light has come on. Is this normal after fitting decats? and can it be switched off during an uprev remap? Cheers jim Quote Link to comment Share on other sites More sharing options...
Ian Posted September 10, 2011 Share Posted September 10, 2011 Yes and yes Quote Link to comment Share on other sites More sharing options...
jimmy vtec Posted September 10, 2011 Author Share Posted September 10, 2011 Thanks bud just wanted to clear that up Quote Link to comment Share on other sites More sharing options...
Dblock Posted September 10, 2011 Share Posted September 10, 2011 Sorry to hijack but my engine light never came on after I fitted decats. Is that weird? Quote Link to comment Share on other sites More sharing options...
Sam Mcgoo Posted September 10, 2011 Share Posted September 10, 2011 Sorry to hijack but my engine light never came on after I fitted decats. Is that weird? Na, they don't always come on. Even if it did you could rest it and it never come back aswell. I would think the more air/gas your exhaust/mods flow the more likely it is to come on. Quote Link to comment Share on other sites More sharing options...
Mark@Abbey m/s Posted September 11, 2011 Share Posted September 11, 2011 The reason the CEL come's on after fitting de-cats is the rear lambda's measure the exhaust gas , with Cats fitted the rear measurement will be a lot cleaner as it is normally measured after the Cat , removing the cats the rear measure is the same as the front lambda measure so the ECU thinks the Cat is working , it will throw a cat in-efficent code. Easily sortable with a Uprev. Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted September 11, 2011 Share Posted September 11, 2011 £20.00 Mechanical fix here viewtopic.php?f=157&t=23979 Alex. Quote Link to comment Share on other sites More sharing options...
HassanZ Posted September 11, 2011 Share Posted September 11, 2011 When I fitted my Kinetix high flow cats, my CEL light triggered when I was on the motorway. After plugging in Narcotix's laptop, the error code showed up as: P0420 - catalyst system effeciency below threshold bank 1 This shows that even HFCs can trigger the EML light. I purchased a couple of lamda spacers off Alex and the EML light has not triggered since Could the EML have triggered as I also have an aftermarket exhaust system fitted with the HFCs? Quote Link to comment Share on other sites More sharing options...
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