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Once i disconnect the battery to reset pc, what is the driving criteria needed to meet the demands of the computer b/4 the check eng lite comes on again?

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If the check engine light comes back on , it's because it has a problem ,, Emission's , engine sensor , computer problem . Need to have it checked for DTC'S diagnostic trouble codes . You need to take it to a qualified repair shop , because you have no clue .
Trouble Codes

Posted on Apr 27, 2017

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I would try disconnecting battery again. Disconnect both cables and touch them together for a few seconds. This will reset all modules. Wierd that you had so many codes after just disconnecting battery. Sometimes very hard to tell if ecm is bad.

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Reset eng warning light, I disconnected both cables on my battery overnight, light still comes on


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Service enj soon lite


Try resetting the computer. Disconnect your battery for 5-10 minutes and reconnect. This should get rid of the light if the gas cap was the problem. If it comes back on take it to an Advanced Auto or Auto zone and get an Engine Diagnostic, they're free. Hope this helps

Jul 26, 2009 | Oldsmobile Alero Cars & Trucks

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I have a 99 lexus es300 and the check engine light+trac off sign posts. i normally disconnect the neg. cord on batt and it works but is that sign a serious problem. should i take it to mechanic and get it...


if u disconnect the battery and the light comes off, but then comes back on that means that there is something wrong. It could be something simple or could be major. only way to know to bring it to the dealer or repair shop and have them hook up a scanner to it. as far as the Trac off light, that comes when the check eng lite comes on. your vehicle turns off the traction control (trac off) when u have a fault code which is why the check eng light is on.

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1 Answer

Check engine lite stays on


If you disconnect the battery for 1 minute and reconnect it the check engine lite will reset. when you start your vehicle again the lite shouldn't be on unless the problem is still present. If the problem is still there the lite will come on again and you should take it in to a shop and have it diagnosed for engine codes and see what the problem is.
Try disconnecting the battery first though before you go spending great amounts of money on something that was probably just a minor glitch in the computer.

Bets of luck and let me know if this has helped you.

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2 Answers

HOW DO I RESET THE CHECK ENGINE LIGHT TO TURN IT OFF, I JUST GOT IT YESTERDAY FROM A SMALL LOT AND THE ENG LITE CAME ON ON MY WAY HOME IT HAS A 130.000 ON IT I WILL NOT BE ABLE TO REGESTER IT WITH THE LITE...


One way is to disconnect the negitive battery cable and let it sit for 3 min. then reconnect. This should reset the computer to the factory settings. If it's a major problem, it will come back on after a while so you may have to do this just prior to getting it inspected. Try it out first thought to see if it will work on your vehicle.

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