2006 Chevy Trailblazer, turns over but won't start.
You need an OBD2 scanner to read fault codes stored and indicated by the Check Engine Light. Entry level scanners are available for around $20-$30 at most auto parts retailers.
The codes merely identify the problem area and are not a diagnosis. Further troubleshooting is always necessary, else it is only guessing and parts swapping which may cause more problems than solved.
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