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What causes the service engine soon light to come on and off intermittently on a 2003 Pontiac grand prix?
Wiki User
∙ 14y ago
I have a 2002 grand prix GT that whenever I fill up with speedway gas the check engine light comes on. I pulled the code at auto zone and i got a "oxygen sensor 1,2 slow to respond" code. It was a warning sign that my oxygen sensors were on the way out. After about 3 months i had to replace 2 of the sensors located before the Catalytic converter. It all depends on whats wrong, it could be a multitude of problems, If you have a old or faulty evaporative canister and purge valve the weather can make the light come one and off. Or it could be a warning sign that a part or sensor may fail soon, as it was in my case. take it to a auto parts store when the light is on. most of them will hook up a code reader to you car for free. You also can rent them so that when the code comes on you can plug it in to the OBD2 port and find out whats wrong.
Wiki User
∙ 14y ago
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