G1uk2010 Posted September 11, 2014 Share Posted September 11, 2014 Is it possible for a dealer to stop the eml light from coming on if a certain code arises?? The reason why I ask is I had mine 350z for about 50 miles and the EML came on. The dealer checked it and it was a P0420 code Bank 1 Cat. The guy changed the O2 sensor and had it checked again by another guy with better equipment for a second opinion. This guy said it was ok when revving etc but if left on tick over it was going near the freshold for bringing the eml light again. We put some cat cleaner in with a full take of vpower on the view of running this tank through to see if it helped to clear it. I am in the middle of running this tank down and the EML has not kicked in again..... but I have randomly checked with a reader and some days it's brought the code up on the reader but not brought the eml light up. Other days it's been clear with no faults. I have checked that when the ignition is on the eml light comes on (so the bulb is still there and working). Why is the cat now not triggering the eml but coming up from time to time on the reader?? Quote Link to comment Share on other sites More sharing options...
longsh07 Posted September 11, 2014 Share Posted September 11, 2014 Is your car standard or do you have any intake/exhaust mods? Only reason I ask is apparently P0420 is "catalytic efficiency below threshold bank 1" and so at a guess could be linked with running de-cats/HFCs. To answer your questions: I don't know about dealers but with an UpRev remap, some of the codes can be turned off. In this case though, if your car is not modified you'd be better off trying to fix the problem causing the CEL. Some codes cause the check engine light to come on right away and stay on. Others have to go to a pending state before they actually display the CEL on the dashboard. Chances are this P0420 is showing as pending on your code reader but has yet to reach the threshold where it will then come on on the dash. 1 Quote Link to comment Share on other sites More sharing options...
G1uk2010 Posted September 11, 2014 Author Share Posted September 11, 2014 (edited) Is your car standard or do you have any intake/exhaust mods? Only reason I ask is apparently P0420 is "catalytic efficiency below threshold bank 1" and so at a guess could be linked with running de-cats/HFCs. To answer your questions: I don't know about dealers but with an UpRev remap, some of the codes can be turned off. In this case though, if your car is not modified you'd be better off trying to fix the problem causing the CEL. Some codes cause the check engine light to come on right away and stay on. Others have to go to a pending state before they actually display the CEL on the dashboard. Chances are this P0420 is showing as pending on your code reader but has yet to reach the threshold where it will then come on on the dash. Thanks for your reply. The car is a 54 plate so DE engine. Only mod I know of is cone air filter. The car had a knackered aftermarket decat exhaust on when I viewed it. The dealer had already ordered an original secondhand full exhaust with cats including manifold as the previous exhaust had a different manifold. The code was pending this morning as I used torque app and it said pending come to think of it. I cleared it then have done about 40 miles... checked and there are currently no codes pending. Edited September 11, 2014 by G1uk2010 Quote Link to comment Share on other sites More sharing options...
longsh07 Posted September 11, 2014 Share Posted September 11, 2014 Fingers crossed it's just the replacement system settling in then. Might be worth taking it to a specialist if it comes back on as from what I read online it could be linked to an exhaust leak which could quite easily happen if cheap gaskets were used to fit the system. Quote Link to comment Share on other sites More sharing options...
G1uk2010 Posted September 11, 2014 Author Share Posted September 11, 2014 Fingers crossed it's just the replacement system settling in then. Might be worth taking it to a specialist if it comes back on as from what I read online it could be linked to an exhaust leak which could quite easily happen if cheap gaskets were used to fit the system. As I have 3 month warranty on it I need to take it back to the dealer. He has been fine and am happy with his service and seems honest, compared to other garages and dealers I have used in the past. I will not clear any pending codes now and see if it pings the eml.... I had a oil change and filter done this morning as the oil seemed a little low. Service history showed that it was last done 5k ago. The guy at the garage (different to where I purchased) who did the oil change had a good look over the underneath and was happy with the condition and said the exhaust and engine etc all looked good/sounded fine. I'll run this tank through and take it from there. 1 Quote Link to comment Share on other sites More sharing options...
longsh07 Posted September 11, 2014 Share Posted September 11, 2014 Good luck - Hope its sorted 1 Quote Link to comment Share on other sites More sharing options...
G1uk2010 Posted September 16, 2014 Author Share Posted September 16, 2014 Good luck - Hope its sorted Still have problem with the eml... been back to the garage and the guy was great he's ordering new cats and need to take the car down next week and he will get them fitted..... hopefully this will sort it. I'm so used to dealers and garages lying to me and trying to fob me off its a refreshing change. Quote Link to comment Share on other sites More sharing options...
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