resetting check engine light

[rcmike]

Is the best way to un hook the positive battery cable for a couple of minutes to clear the computer to see if check engine light comes back on ? thanks

[txab]

That's one way. The other is to have a scanner with the ability to clear codes

[Doug_Scott]

Do yourself a favour and change your idea of disconnecting the positive cable first for this. It makes zero difference to the system which cable is removed first, but, if you remove the negative cable first, and by accident the wrench that is loosening the nut happens to slip and touch the fender, no problem. Try that with the positive cable being removed first, and you will now have a wrench welded to the top edge of the fender..

 

You should ALWAYS remove the ground side first. In virtually all vehicles you will come across that is the negative lead, but, on positive ground vehicles it would be positive cable. Our trucks are negative ground, so always remove NEGATIVE lead first, and connect it back up LAST.

[Charles Bailey]

Is there a way to reset OBD2 CODES without a scanner or reader or unhooking the neg on the battery? I want to see if the adjustments I've made will work without driving 250 miles to get the monitors working again. Thank you.

[carkhz316]

Yes, drive the truck through 40 drive cycles (start up cold, run up to temp for something like 20 minutes and XX miles, then shut down to cool off; repeat 39 more times)