Advanced Diagnostics
Advanced Diagnostics - DTC P0158: Front Secondary Heated Oxygen Sensor (Secondary HO2S (Bank 2, Sensor 2)) Circuit High Voltage
General Description
The front secondary heated oxygen sensor (HO2S) (bank 2, sensor 2) detects the oxygen content in the exhaust gas downstream of the three way catalytic converter (TWC) during stoichiometric air/fuel ratio feedback control. The front secondary HO2S controls the air/fuel ratio from the front A/F sensor output voltage to optimize the TWC efficiency. After current is applied to the front secondary HO2S heater, if the front secondary HO2S output continues to exceed the upper limit used during feedback control, the powertrain control module (PCM) detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type, OBD Status
Enable Conditions
Malfunction Threshold
The front secondary HO2S output voltage is 1.27 V or more for at least 5.0 seconds.
Driving Pattern
1. Start the engine, and let it idle until the radiator fan comes on.
2. Drive immediately at a steady engine speed between 1,500 - 3,000 rpm for at least 1 minute.
- Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.
Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the battery.
General Description
The front secondary heated oxygen sensor (HO2S) (bank 2, sensor 2) detects the oxygen content in the exhaust gas downstream of the three way catalytic converter (TWC) during stoichiometric air/fuel ratio feedback control. The front secondary HO2S controls the air/fuel ratio from the front A/F sensor output voltage to optimize the TWC efficiency. After current is applied to the front secondary HO2S heater, if the front secondary HO2S output continues to exceed the upper limit used during feedback control, the powertrain control module (PCM) detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type, OBD Status
Enable Conditions
Malfunction Threshold
The front secondary HO2S output voltage is 1.27 V or more for at least 5.0 seconds.
Driving Pattern
1. Start the engine, and let it idle until the radiator fan comes on.
2. Drive immediately at a steady engine speed between 1,500 - 3,000 rpm for at least 1 minute.
- Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.
Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the battery.