Need help with check engine light before smog test please help
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Need help with check engine light before smog test please help
alright, so its my wife's 1997 nissan sentra, which was throwing a code for egr valve. didnt have time to fix it so i erased the code with my scantron and went for a smog check. I passed all the levels for O2, Co and whatever, but the guy said i failed the mil (engine light). He said he knew it was turned off. damn obd II. so now that the light is off, how do i know when i can take it back for a retest. i get a free retest in 15 days. what should i do now? thanks for any input everyone!
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When you reset the ECU to clear an CEL/MIL/SES light, the internal status goes from ready to not-ready. You have to complete a "drive cycle" before the ECU determines that all is good and then it will go to "ready".
There is an official set of driving operations that define a "drive cycle" but it's probably a lot easier to just drive it around for a week or two before goes back to get the re-test.
The problem is that if you truly have an emissions problems, the CEL will probably come back on
There is an official set of driving operations that define a "drive cycle" but it's probably a lot easier to just drive it around for a week or two before goes back to get the re-test.
The problem is that if you truly have an emissions problems, the CEL will probably come back on
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thanks guys, i think ill drive it for another week and see if it pops back on. in the meantime, ill see if i can clean or replace the egr valve/system or whatever i need to do. thanks again.
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