i had a check engine light and i took it to autozone and had it checked for free, i had like 7 codes that came up, i took them all down and the guy resetted the whole computer so the check engine light would go away. now when i went to a mechanic to fix those codes, after he ran a diagnostics he found nothing because they resetted it at autozone, and i lost the paper i wrote the codes down on. my question to you guys is, how do i make the CEL come back on again so the codes can show up on the diagnostics?

 

Wait.

Drive around a bit, but mostly just wait, that's the only thing that will get you those codes back.

 

D/C the battery every time you turn it off ...

 

so once i turn the battery back on the engine light will come up?

 

.. Just leave it alone ...

 

you lost the paper?..lol find it ... man you sound like a sloppy kid .. i feel bad for your car

you cant just disconnect the battery and have the codes come back... you have you wait or drive for a while so the ENGINE COMPUTER can sort out the codes again and flick your cel on ...

 

if the codes aren't coming back then they must not have been anything serrious huh? or maybe they were old stored codes?

 

Or somethings on the blink.

Try knocking your car around a bit, maybe you need to jar something off hehe jk.

 

Check the codes again ...

 

If there are no more codes and you SES light stay out why do you care?

 

because my car shakes and it's eating gas

 

your light should evenually come up again..... gas poblem is most likely knock sesor and 02(s)