Just got an '02 Prius and it decided to throw some codes today. Originally, a dealership pulled codes when my wife was driving it, and they just told her it was the gas cap. They didn't tell her right away what the codes were, so she called them back and they only said P1436. The light came on again today and I see codes P1436 and P0420. The light came on after the car had been sitting for 4.5 hours and had a chance to cool off. I started the car and the ICE ran for about 30 seconds and the check engine light came on. No other issues seen. Battery charge seems to stay around 60-80% and never goes extreme. Car drives fine. Any ideas? I've put 60 miles on this car and do not need expensive failures already.