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Registered
Join Date: Jul 2001
Location: Cave Creek, AZ USA
Posts: 44,720
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My 993 has failed a few times with no CEL on. But the readiness monitors on the early OBDII cars can be finicky and if any of them are not in ready mode, it will fail to communicate with the reader and you fail. I could remove my cats and run straight pipes. As long as the monitors are in ready mode, it's an automatic pass.
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2022 BMW 530i
2021 MB GLA250
2020 BMW R1250GS
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