DTC Advanced Diagnostics: P0150 (3.0L Engine)
DTC P0150: Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) Out of Range
General Description
The front air/fuel ratio (A/F) sensor (bank 2, sensor 1) is installed in the exhaust manifold and detects oxygen content in the exhaust gas. The front A/F sensor (bank 2, sensor 1) transmits a signal to the powertrain control module (PCM), and the PCM controls fuel injection duration by comparing the target air/fuel ratio with the front A/F sensor (bank 2, sensor 1) signal. The front A/F sensor (bank 2, sensor 1) is composed of detection element, reference oxygen chamber, diffusion chamber, and heater, etc., and enables feedback control of all ranges. The PCM presumes an oxygen content in the exhaust gas from the current value input from the front A/F sensor (bank 2, sensor 1). If the detected current exceeds the set range for a specified duration, the PCM detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 10 seconds or more |
| DTC Type | Two drive cycles, MIL on |
Enable Conditions
| Condition | Minimum | Maximum |
|---|---|---|
| Front A/F sensor (bank 2, sensor 1) impedance | - | 120 Ohm |
| State of the engine | Running | |
Malfunction Threshold
The element current value is out of range of -5.223 mA to 2.593 mA for at least 10 seconds after the front A/F sensor (bank 2, sensor 1) is active.
Possible Cause
- Front A/F sensor (bank 2, sensor 1) failure
- PCM internal circuit failure
Confirmation Procedure
Operating Condition
Start the engine. Hold the engine speed [Engine Speed] at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
[ ]: HDS Parameter
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, the freeze data, and the on-board snapshot 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, the freeze data, and the on-board snapshot can be cleared with the scan tool clear command.