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Short answer: No. Of course, I don't know what state you're in, what the emissions requirements are, etc. Some engine faults that show up as a "Check Engine" light don't necessarily cause your car to fail the test (depending on your state), so clearing the light might not be necessary. Clearing the DTCs (Diagnostic Test Codes) and turning off the Check Engine light sets a code in the car's computer. Subsequently, any OBDII reader can detect this. The car has to be driven for a certain amount of time in a range of conditions (depends on make/model) to reset the computer "Ready" signal. Unless their OBDII reader detects this "Ready" signal, the smog check guys will fail you. In general.

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17y ago

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