Question about 1999 GMC Suburban

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Anybody know the most common reasons for a "service engine soon" light to come on? my truck has about 157k on it, could it be from the high mileage and it just needs a check up? thanks

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No, cannot be for checkup. Most common problem is oxygen sensor packing up, but we never guess on the reason. It is a simple matter to scan the OBD2 connection to obtain the trouble code. Please see my tip at These are genericinstructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

Posted on May 18, 2011

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These codes are dealer specific. Please call you local dealer and they will give you the exact meaning.

For now I think you may find the code needs to be verified.
Here is my advice.
Have the reading done by - Auto Zone and also Advance Auto all over again. If the codes match
Take down the vin# - call the dealer and tell them the code. Ask them what it means and - -ask if your vin# brings up and recalls or service needs as issued by the factory. Some things never go out of date.

One last this - your header here says 1995 -your note says 1998. You need to sort that out as well.

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