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there is no "diagnostic mode" check ALL the fuses xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx If you are referring to the diagnostic connecter being accessed and the light does not come on then you need to check and replace the bulb. If it was a fuse, which would be the ECM, the car would not even run.

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Q: 1997 Pontiac grand am se 3100 no check eng light comes on at all not even in diagnostic mode?
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