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Re: Car inspections and the CEL
When I had my BMW, I had a Peake Research scan tool that could be used to reset the oil change/inspection lights and also clear the error codes. However, when I cleared some codes just prior to an emissions check (I knew I had an O2 sensor or evaporator issue), the computer at the testing facility could tell that the car's computer was recently reset and thus it failed me. Apparently once the codes are cleared, the car's computer takes several on/off cycles to scan for errors before sending a "ready" signal through the OBD, and the testing facility's computer required this "ready" signal to be present. They asked if I recently had some repair work done, and as I knew what they were getting at, I said yes. They suggested I come back in a few days after the system reset itself...though I knew this meant the CEL would return.
Illinois used to allow you to request a manual (tailpipe) test if you believed the codes were not affecting your emissions, but now they don't allow that -- you have to pass the OBD test. If you fail, you have to have it repaired until the codes are clear. If the mechanic is unable to get the codes to clear, you have to show proof that you spent at least $450 on repairs.
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