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Have a 02 Rav4 where I replaced catalytic converter & all 4 sensors approximately5 years ago. I don't put many miles per year on it.
Codes p0430 and p0420 came back on recently with cel on.Changed both o2 sensors. Light keeps coming back after clearing them. Heard this is a common problem with Rav4s and could be false codes. I've heard conflicting reports about Toyota dealership can reflash ecu to correct problem.True or False? Thanks
 

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I would follow Eric the Car Guy recommendation, read the O2 sensors, measure the temperature in and out of the CATs.


I got rid of the fault code direct treating with Sea Foam but want to get a OBD II and read the sensor voltage. I also cleaned the MAP sensor.
 
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