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detect cleared engine fault?

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So help me out here. If I have an engine fault light on, and I clear it with an OBD reader, can inspectors see that it has been cleared? I have a P0420, and I'd like to wait a few months to get a (likely very expensive) repair, but I need an inspection NOW. I have heard both that they can't detect it, and I can pass inspection readily, and I've also heard that they can detect it.

Edited by Danl

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