First Timer with an issue

This is the final update on this thread... The OP drove their car home, about 5 plus hours drive, and 420 cat error light came on again. But we'll never be able to investigate if the aftermarket cat failed or it was something else because the car hit some ice and was totaled in an accident about 24 hours after it was picked up.

So if you know anyone who has a low priced Gen 2 Prius to sell in eastern Idaho / Western Wyoming area where he's in college right now he'd be very happy to hear from you.