Repair information for the OBD-II trouble code P0420 - Catalyst System Efficiency Below Threshold (Bank 1)

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 ...

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... Secondary Air Injection System Relay "A" Circuit Malfunction   P0419: Secondary Air Injection System Relay "B" Circuit Malfunction   P0420: Catalyst System Efficiency Below Threshold ...

P0420: Catalyst System Efficiency Below Threshold (Bank 1) 5.55% P0430: Catalyst System Efficiency Below Threshold (Bank 2) 1.91% P0421: Warm Up Catalyst Efficiency Below Threshold (Bank 1) 0 ...

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.

Catalyst system efficiency below threshold (Bank 1) - P0420 Catalyst system efficiency below threshold (Bank 2) - P0430; D2.) Catalyst Efficiency Monitor - Diagnostic Trouble ...

P0420....Catalyst System Efficiency Below Threshold (Bank 1) P0421....Warm Up Catalyst Efficiency Below Threshold (Bank 1) P0422....Main Catalyst Efficiency Below Threshold (Bank 1)

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.