DTC P2272
DTC P2272: Front Secondary Heated Oxygen Sensor (Secondary HO2S (Bank 2, Sensor 2)) Circuit Signal Stuck Lean
General Description
The front secondary heated oxygen sensor (secondary HO2S (bank 2, sensor 2)) detects the oxygen content in the exhaust gas downstream of the front warm up three way catalytic converter (WU-TWC) (bank 2) during stoichiometric air/fuel ratio feedback control. The powertrain control module (PCM) controls the air/fuel ratio from the front air/fuel ratio (A/F) sensor (bank 2, sensor 1) output voltage so that the front WU-TWC (bank 2) efficiency is optimized. When power is applied to the front secondary HO2S (bank 2, sensor 2) heater, if the front secondary HO2S (bank 2, sensor 2) output continues to be low (lean) during feedback control, the PCM detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type, OBD Status
| Execution | Continuous |
| Sequence | None |
| Duration | 35 seconds or more |
| DTC Type | Two drive cycles, MIL on |
Enable Conditions
| Condition | Minimum | Maximum |
|---|---|---|
| Elapsed time that secondary HO2S activity is not monitored after starting the engine | 20 seconds | - |
| Engine coolant temperature [ECT SENSOR 1] | 156 °F (69 °C) | - |
| Intake air temperature [IAT SENSOR (1)] | -13 °F (-25 °C) | - |
| Fuel trim | 0.73 | 1.47 |
| Fuel feedback | Closed loop | |
| Other | Cruise load or more | |
[ ]: HDS Parameter
Malfunction Threshold
The front secondary HO2S (bank 2, sensor 2) output voltage [HO2S B2 S2] is 0.05 V or less for at least 35 seconds.
Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
- Front secondary HO2S (bank 2, sensor 2) lean stuck
Confirmation Procedure
Operating Condition
- 1.
Start the engine, and let it idle until the radiator fan comes on.
- 2.
Drive immediately at a steady engine speed [ENGINE SPEED] between 1, 500 - 3, 000 rpm for at least 35 seconds.
- When freeze data is stored, drive the vehicle under those conditions instead of Driving Pattern step 2.
- Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.
With the HDS
None.
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 12 volt battery.