| DTC Data Sheet | |
| System | Powertrain |
| Standard | SAE J2012 / ISO 15031-6 |
| Fault type | Circuit |
| Official meaning | O2 Sensor Circuit Malfunction (Bank 2, Sensor 1) |
General circuit fault on the bank 2 upstream oxygen sensor. The PCM has detected an electrical problem with the sensor signal, ground, or supply.
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P0150 Quick Answer
General circuit fault on the bank 2 upstream oxygen sensor. The PCM has detected an electrical problem with the sensor signal, ground, or supply.
What Does P0150 Mean?
O2 Sensor Circuit Malfunction (Bank 2, Sensor 1). General circuit fault on the bank 2 upstream oxygen sensor. The PCM has detected an electrical problem with the sensor signal, ground, or supply.
Symptoms
- Check engine light
- Open-loop fueling on bank 2 — rich operation and reduced fuel economy
- Possible bank 2 fuel trim codes alongside
Common Causes
- Failed bank 2 upstream O2 sensor
- Open or shorted signal wire
- Connector corrosion or backed-out terminal
- Loss of sensor power or ground
- PCM input damage (rare)
Diagnosis Steps
You’ll need a scan tool capable of reading live powertrain data, a digital multimeter, and access to the wiring diagram for the specific platform.
- Read live data: bank 2 sensor 1 voltage. Watch for frozen readings, stuck high, or stuck low.
- Disconnect the sensor and verify the bias voltage at the harness — the PCM normally pulls the signal pin to ~0.45 V when no sensor is connected.
- Verify heater supply (12 V) and ground at the connector.
- Replace the sensor if circuit checks pass.
Possible Fixes
- Bank 2 upstream O2 sensor replacement
- Wiring or connector repair
Can I Still Drive With P0150?
The vehicle will usually still drive with P0150 stored, but performance, drivability, or emissions will be degraded. The PCM may inhibit emissions monitors and limit closed-loop fueling adjustments. Drive to a workshop, but don’t ignore the code long-term — degraded sensor data can mask other faults and shorten catalyst life.
How Serious Is This Code?
P0150 is a moderate-priority fault. It will not prevent the engine from running but unaddressed it can damage the catalytic converter, reduce fuel economy, or cause failed emissions testing. Address within a few drive cycles.
FAQ
Will P0150 clear itself?
Only if the underlying fault was intermittent and self-corrected. Most root causes are persistent and require physical repair.
Can I clear P0150 without fixing it?
You can clear it with a scan tool, but it will return as soon as the fault condition reappears — typically within one or two drive cycles.
Is P0150 related to other codes?
Often, yes. Adjacent codes in the same circuit or system frequently set together — if P0150 is present, scan for related codes and address them as a group.