CEL not on after midpipe install :[
03-02-2008, 07:05 PM
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CEL not on after midpipe install :[
As the title stated i recently installed my turboxs midpipe with my turboxs cat back. And my cel did not come on at all 
my car is a 04 model with about 40,000 miles and my mods are a k&n drop in filter and a canzoomer piggyback and the turboxs exhaust. Could the canzoomer be causing my cel to not come on?? im so confused lol
my car is a 04 model with about 40,000 miles and my mods are a k&n drop in filter and a canzoomer piggyback and the turboxs exhaust. Could the canzoomer be causing my cel to not come on?? im so confused lol
03-02-2008, 08:17 PM
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yea ive been driving alot to school and back which is like 20 miles a day and i have driven it in many conditions from normal to like 4th gear pulls on the highway still no light..... wat if my car is misfiring and the check engine light dont come on that would be serious
03-02-2008, 08:51 PM
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this could be a major problem... lets say my car could be misfiring and the check engine light wont come on... im thinking the canzoomer mite have disabled the check engine light
03-02-2008, 09:23 PM
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If you have a misfire the CEL will light up. The downstream O2 sensor has no affect on misfire monitoring. The only thing the downstream sensor does is monitor catalyst efficiency. When the car is in closed looped operation the ECU looks at the signal from the upstream O2 sensor to control your air/fuel ratio. The ECU then knows from that signal what the downstream sensor should be reporting if the cat is working properly. If the two signals do not correspond with one another then you will have a CEL for either catalyst system inefficiency or a voltage range issues on the downstream unit. When the ECU is running through it’s readiness monitors, the catalyst efficiency is the last thing that is checked. If you don’t meet the correct driving conditions for all of the other monitors to set, it may take a week or two for that CEL to come on. However, (I have no explanation for this) I have a friend with a Sentra SE-R Spec V that ran without cats or an O2 simulator for over a year and never had a CEL.
03-03-2008, 09:06 AM
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