CUSTOMER CONCERN The check engine light is on with catalyst-efficiency DTC P0420 after induction-system service. CAUSE Fuel-control, oxygen-sensor, and converter testing confirmed that the catalytic converter was no longer operating efficiently. CORRECTION Remove and replace the failed catalytic converter.

CUSTOMER CONCERN The check engine light is on with oxygen-sensor circuit DTC P0136 stored. CAUSE Circuit, fuel-trim, and exhaust-leak checks confirmed a failed rear oxygen sensor at Bank 1 Sensor 2; the hybrid-control calibration also required the applicable update. CORRECTION Remove and replace the Bank 1 Sensor 2 oxygen sensor, then update the Hybrid Vehicle Control ECU with the applicable calibration.

CUSTOMER CONCERN The check engine light is on with catalyst-efficiency DTC P0420 stored. CAUSE Fuel-trim, exhaust-leak, and oxygen-sensor checks confirmed that the catalytic converter was no longer operating efficiently. CORRECTION Remove and replace the catalytic converter.

CUSTOMER CONCERN The check engine light is on with DTC P0130; the vehicle may otherwise run normally or surge while driving. CAUSE The confirmed failure is the universal heated oxygen sensor at Bank 1 Sensor 1. CORRECTION Remove and replace the Bank 1 Sensor 1 universal heated oxygen sensor.