Wednesday 21 September 2011

How long until the Check Engine light turns off after messing with the car battery?

My dad used my car battery to jump start his truck but now the Check Engine light is on. I know when the battery gets changed, the light turns on but I forget how long it takes for the light to turn off.How long until the Check Engine light turns off after messing with the car battery?That light shouldn't come on just jumping another vehicle, disconnect 1 battery cable for a couple of minutes and then rehook to see if the light goes out and if it comes back on you have problems and need to get the code read.
How long until the Check Engine light turns off after messing with the car battery?
Uh... it should go off right away... maybe u screwed up ur alternator or something...
How long until the Check Engine light turns off after messing with the car battery?
Usually after 40 cycles.... He will need to drive the car for about 20 miles until the engine re-learns how it drives.

Dr A
It shouldn't have gone on. Better get the codes read and go from there.
It's probably easier to take it to a mechanic and have them check it out.
It can take up to 200 drive cycle to turn the light off. That not the same as a key cycle a engine cycle is from cold to warm and have to go throw the readyness monitors. Easier would be to go to a shop and have them scan the code and turn the light out. Better would be to treat it as a real code because your dad could have damaged something in your car.
See if it goes out after a 20 mile drive. If not, disconnect the battery for 10 minutes and connect it back. Hopefully the light doesn't come back on. If it does, have the trouble codes checked.
What happens if you hold in the check engine light reset button under the dash while starting the car?
Some vehicles have a Battery temp sensor mounted in battery tray,might have unpluged it or damaged it.
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