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In my experience, most pre-96 vehicles can be reset simply by removing the battery cables for a little while. Those are OBD1 computers. In OBD2 computers, you are supposed to have a scan tool to reset the comp, which I have and so does Advance auto etc, for free they will do this. Or sometimes you get lucky by unhooking BOTH battery cables for a while anyway on the post 96 cars. What this does is erase all settings the computer had and it relearns them as you drive it again. This might work as well and might not. Some do this in order to bypass the check engine light when an inspection is due because the vehicle will not pass with the CEL on. It will relearn, but it also takes time for the readiness monitors to get ready to be inspected. So, there is a short window there before the CEL again relights for the affected part/code. I'd try unhooking the cables for an hour, won't hurt. Might not help, but worth a shot, it's free.
What else can I help you with?
How do you change the fuel filter and where is it located in a 2003 Pontiac Sunfire?
where is the fuel filter located on a 2003 Pontiac sunfire
Where is the crank position sensor located on a 2003 Pontiac Sunfire?
2003 sunfire
Does Pontiac 2003 sunfire has a timing belt?
No, it has a cam chain.
How many cylinders in a 2003 Pontiac sunfire 2 dr?
4
What is the correct tire pressure for a 2003 Pontiac sunfire?
30 to 35 psi
What is the tire size for a 2003 Sunfire?
The 2003 Pontiac Sunfire came from the manufacturer equipped with 225 65R 15 tires. The back and the front tires were the same size.
How do you change a water pump on a 2003 Pontiac Sunfire?
Take it out and put a new one in!
How do i fix my evaporative emissions system sensor on a 2003 Pontiac sunfire?
buy a new one
How do you reset 2003 BMW 325I computer?
Check out the realted link for some advice on how to reset the computer in your 2003 BMW 325I computer.
How do you reset computer on a 2003 Ford Explorer after oil changes?
how do you reset computer on a 2003 ford explorer after oil changes
Does a 2003 Pontiac sunfire have a cabin air filter?
The 2003 Pontiac Sunfire does not come equipped with a cabin air filter. Many vehicles from that era, including the Sunfire, were designed without this feature. If you're looking to improve air quality inside the car, consider using an aftermarket air freshener or regularly cleaning the interior.
How do you reset my OBD2 computer on my Sunfire 2003 automobile?
If you want to reset the "check engine" light you should first determine and correct the reason why the light came on in the first place. Most full service auto parts stores can help you with that at no cost.
