The code is P0420 Catalyst System Efficiency Below Threshold (bank1). I have reset the check engine light and seem to receive the error when traveling at speeds above 65 mph for a ...
... Secondary Air Injection System Relay "A" Circuit Malfunction P0419: Secondary Air Injection System Relay "B" Circuit Malfunction P0420: Catalyst System Efficiency Below Threshold ...
P0420 is "Catalyst Efficiency Below Threshold" P0442 is "EVAP Emission Control System Leak (small)" On the 420 it means you CAT convertor is operating below efficiency.
P0130 - front oxygen sensor circuit range/performance problem (lean) and P0420 - catalyst system efficiency below threshold. The oxygen sensor heater monitor has run to completion ...
We checked for DTCs and a P0420 (Catalyst System Efficiency Below Threshold) was retrieved. From past experience I knew that Toyota provided Catalyst Monitor Mode $06 data.