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 http://www.fixya.com/cars/r5932051-check_engine_light_check. 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 Some things never go out of date.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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