Interesting question. If your car passes its yearly emissions test, is there any way they can detect if it was repaired or not?

More specifically:
- If you don't get it fixed, it passes the test because of the cheatcode.
- If you do get it fixed, then it passes the test honestly.

I don't know if there's a way for a local emissions-test station to be able to tell the difference. Is there something like a firmware version number that the OBDII connection reports? If so, they could probably check that.