Hello, I have a gen 2 prius w/ 300,000 miles on it. Car runs beautifully. I was due for an emissions test but got a check engine light. We only got the catalytic converter replaced w/ an aftermarket one. The check engine light went away, it has not appeared in over 2 months. However, using an OBD2 scanner my car isnt ready for emissions. I have driving the car way over 5K miles since changing the converter. People have mentioned a drive cycle but I've literally driven the car so much by now. Evaporative system is reported as : not ready Oxygen sensor: not ready what do I do about this?
You need to get the car properly scanned because something is keeping the emissions system from completing it's checks - most likely the aftermarket CAT. Any Prius aware scanner should be able to tell you what's hanging-up the diagnostic system - It's stuck in a retry/recheck cycle.
You need to complete an emission test cycle to trip another emission code. As I stated earlier, it's stuck in a retest cycle - a good scanner will tell you which test it's stuck on. I'm just guessing it's that aftermarket CAT. What codes were you getting BEFORE you replaced the CAT?
