is that the running rich CEL? I got a running rich CEL i believe it was PO172, but i thought it was an O2 sensor and took it into toyota to repair under warantee, comes back it was a bad MAFS and i supposable needed a new Air Filter
. I paid $65 for the diagnosis, then turned around and cleaned my MAFS instead of buying a $171 one from toyota and the car is running great, i feel a defininate increase in power and a much smoother power curve. I had never cleaned my MAFS before, since i'm running a paper filter i didn't see a need to, but it was definitely dirty. I recommend cleaning your MAFS to see if the problem still exists in your O2 sensors.