Circuit Description

The Heated Oxygen Sensor 2 (HO2S 2) located rear of catalytic converter produces an output signal relative to oxygen storage capacity of catalytic converter. HO2S 2 signal is less active than signal produced by front oxygen sensor.

Conditions for setting this DTC are as follows:

• Engine coolant temperature is greater than 158°F (70°C).
• Engine run time is greater than 30 seconds.
• TP sensor angle is 4-55 percent.
• No presence of I.C.codes: P0106-P0108, P0112, P0113, P0117, P0118, P0121-P0123, P0300-P0304, P0506, P0507, P1406, P1441.
• Engine is in closed loop.
• HO2S 2 voltage is 460 mV for greater than 42 seconds.