You need to scan ECM with a code reader. Most code reader has a Inspection Monitor Status (I/M). It will show Oxygen Sensor Ok, Evap Ok, CAT Ok..... you either get Ok, Ready or Not ready status. Ask your auto parts store near you if they would scan computer. If they do, ask them to Select I/M Status because you want to make sure all items are Ok or Ready for your Smog Clearance.
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