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Ron Z.
Ron Z., - Pontiac Tech -
Category: Pontiac
Satisfied Customers: 18114
Experience:  18+yrs experience. State Inspector and Pontiac Diagnostics
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2000 Pontiac Grand Am, service engine soon light is on steady....

Resolved Question:

2000 Pontiac Grand Am, service engine soon light is on steady.... any troubleshooting suggestions before I head to the mechanic?
Submitted: 6 years ago.
Category: Pontiac
Expert:  Ron Z. replied 6 years ago.

When the Service Engine Soon light comes on, it's the on-board computers way of telling you it sees a problem in one of the monitored systems. If you are not experiencing drivability issues (surging, stalling, rough idle), then more than likely it is a problem in an emissions system. Unfortunately, there are litterally 100s of sensors monitored and to take a "guess" would just be inefficient and a waste of time and money. A good place to start is at your local parts store (ie. NAPA, AutoZone, Advanced). Most of these stores will read the "p-codes" from the on-board computer for Free in hopes of selling you the part/sensor you need to make the repair. Once you have this p-code, it will tell you which system is faulting, and usually which sensor/part is the culprit, and then you can more accurately begin a diagnostic and repair effort. If the people at AutoZone cannot help you to your satisfaction, you can take the p-code(s) here and any one of our Techs can tell you what it means, and give you advice on how to diagnose and repair the problem.

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