The engine computer has detected a malfunction and set a code.
How do I reset the service engine light on a 2003 Chevy Trailblazer?
Maybe you should service the engine soon. :P
can you tell me why my 1999-2000 Chevy trailblazer light is on
Check
When service engine light is on on a 2003 Chevy Trailblazer, the problem could be a faulty thermostat, a circuit range performance problem, or any other problem.
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That requires an OBDII engine scanner.
Have vehicle scanned to determine the problem and have codes cleared
The check engine light (service engine soon) comes on and stays on when a problem is detected by the self diagnosis system of your vehicle.
I reset the check engine light on my jeep by disconnecting it from the battery.
time for an oil change
You have to remove the instrument cluster to service the light bulbs.