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My story is that after the CEL came on (on my 2000 4 cyl auto Camry), a local mechanic hooked up an OBD II tester and determined that it needed a new ERG valve which I purchased from a Toyota dealer and the local mechanic installed. After 2 days, the CEL came on again. Took it back to the local mechanic and he hooked up the tester again and could find no problems. Then he drove the car with the tester hooked up with still no problems. The only thing I've been able to find as a possible cause is a poor seal on the gas cap. Any other known causes for this light to go on, but nothing showing up on the OBD II tester? TIA
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