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After you reinstall and tighten the gas cap, the light should go off after a few driving cyles if this is what caused the light to come on.

Go to Autozone... they have a scanner that can reset the lite.

Simply disconnect your battery. This will reset the check engine light. If it wasn't the gas cap causing the error or if the cap is faulty, it will come back on. In that case you'll need to determine the code that is causing the light to come on. Some vehicles can flash the code using one of the lights on the dash. First you have to initiate it by turning the ignition switch on the off in a certain sequence. Unfortunately, I don't know if this works with Camry's.

the last guy is correct but you cant make the code flash by turning the key. its obdII and there is no way to get a code without a scantool.

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Q: If you left the gas cap off your 2004 Camry and now the check engine light is on can you reset this yourself without going to the dealer?
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