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The MIL or malfunction indicator light is telling you that you have a problem with your engine operation or efficiency.
You will need to have the codes read with an OBDII code reader at a garage or auto parts store and repair whatever it indicates the problem is.
The same tool can clear the codes as well as pulling the ecm fuse or disconnecting the battery for 30 seconds but the light will not stay out until the problem is addressed.
Also clearing the codes without making the repairs will not get you to pass emissions as the system will need to go through a series of system checks before an emissions station can check it, a 2003 vehicle needs to have 6 of 7 tests complete for an emissions test to go through and it may take several days of driving to accomplish this. By that time whatever triggered the mil will show up again.
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