my check engine light has been on for about 2 weeks now. however when i started up the car to go to class this morning, the light was no longer on. hasnt come back on all day. should this cause concern? or should i just assume it was something silly that fixed itself?

is there a way to look into what it WAS? or should i just let it slide?

im so very confused.

 

Check the code. That happened to me, my mechanic told me it was the fuel I was using. So I switched to Shell, and the lights gone.

 

same with me my post cat O2 was showing as bad, 2 weeks later (last Thursday to be exact) start up and no more light, just a bad batch of gas or something. . .

 

do you have a scanner? scan it just incase.

 

no i dont have a scanner, i could run by autozone if you guys think i still should.

im about half tank, filled about halfway through the light being on. think that could still be it?

oh and i swear my car was chugging too and that now its not... it might be my imagination but im not entirely sure.

 

do hear any knock from the cheap gas? My car goes crazy if i use 89. I only use BP or Shell 93 octane. Sometimes when i go to the track i get that 110 stuff..but for u don't go that high because i could care less if my engine goes out... just gives me another reason to swap.

 

nah i never had a problem from the first 5000 miles using 87. just the last two weeks i had the light on and now its just gone.

 

My car had a cat/02 code for 1000 miles then shut itself off. No biggie. I simply clear it when it comes on every once and a while and drive peacefully.

 

well how do you know the sensor isnt bad?

or rather, there has to be a reason it comes on. hmmmm

 

50 turns of the key will reset the CEL. My car does this all the time but the light comes back on. LOL,matter of fact it's off right now. Hopefully it won't came back on but i knwo it will because i'm getting front right 02 censor code.

Their's a chance it will stay off for a while but it may very well come back on.

 

if you fill up your gas tank and forget to screw the cap back on tightly it will cause the CEL to come on, it will turn off once you tighten it.

 

A32 CELs are so strange. Mine likes to pop up occasionally to tell me there's no problems found.

 

ure gona have to wait a pretty long time for the VQ to go out on 87 octane AHAHA

and no, anything above 91 will not help u if ur timing is not advanced

 

so no matter what the problem if you turn your car on 50 times it goes away? that doesnt seem to make much sense.

but i guess after about 2 weeks i drove about 50 times. this is interesting.

 

i get the same thing code 0505 didn't record the fault or whatever. i know my rear O2 is bad though i got the code a logn time ago so i'm suspecting that's the cause.

 

It's not 50 times its more like 15-20 drive cycles. And it just turns the light off, the code is still stored in the ECU. Get it read by a scanner. Don't just use an autozone scanner. Go to a dealership and spend the 75 bucks for the one hour of labor and really find out whats wrong with your car. The Snap-on brick they should use will tell you everything about a car.

 

i had a rear o2 code for about 4 months and the light never went away, i changed the sensor and its gone

i would assume i drove more than 50 times in those 4 months so i dont think there is such a count in the ecu. why would the ECU want/need to be constantly reset ?

 

It could have been cheap gas causing the knock sensor to fail.

 

jesus... does no one know how to use a screw driver?
Just read the codes yourself. If that doesn't yield anything, then consider letting the dealer rape you and tell you what's wrong and how many 100's/1000's it will cost to fix. And if it's just a random light and you notice nothing wrong other than that, I would not take it to the dealer (in case you were going to). Also cheap gas does not cause the knock sensor to fail, but it will cause knock!

 

seriously if you're concerned check the code(s) yourself or take it to autozone to have them read. No need to spend money like someone stated by getting codes read from a dealer...that's just ridiculous at this point.

 

I was gonna say the same thing. Takes all of a minute to turn the screw and count blinks, and then turn it once again to reset. I do that whenever my CEL turns on.