diagnostic code p0420 & 0430 came on after replacing air/fuel mix sensor. I this simply a reprogramming of ecu?
Year: 2003Make: ToyotaModel: Rav4Engine: 2.0 4cyl.
Have replaced air/fuel mixture sensor and resolved former check engine light problem but quickly received the 0420 & 30 cat code.
First, check to make sure there is no exhaust leak at the A/F sensor you installed as this will set the codes.
If ok, then you need to have the ecu reflashed at your local toyota dealership. usually 1/2 hr labor to do this
Automotive Repair Shop Manager, Technician