O2 Sensor Circuit High Voltage Bank 2 Sensor 1
What it means
P0152 means the upstream oxygen sensor on bank 2 (sensor 1) is reading an abnormally high voltage, which signals a constant rich condition or a wiring short. The ECM uses this sensor to balance the air-fuel mixture, so a stuck-high reading can push the engine rich, hurting fuel economy and emissions. It does not prevent the engine from starting.
Can I keep driving? Usually yes, but the engine may run rich and rough; get it checked soon to avoid wasting fuel and fouling the catalytic converter.
Real-world scan data
Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.
Common symptoms
What you'll notice
- Check-engine light on
- Rough idle or hesitation
- Reduced fuel economy from a rich mixture
- Black smoke or a fuel smell in some cases
- Failed emissions test
Common causes
Most likely first
- Signal wire shorted to voltage or to the heater circuitLikely
- Contaminated or failed bank 2, sensor 1 oxygen sensorCommon
- Genuinely rich mixture (leaking injector, high fuel pressure)Common
- Corroded or wet connector at the sensorLess often
- Rarely, an ECM faultLess often
How to diagnose & fix
Work through it in order
- Read live data to see whether the sensor voltage is pegged high.
- Inspect the sensor connector and wiring for shorts to voltage or the heater supply.
- Check fuel trims for a real rich condition (leaking injector, fuel pressure).
- Replace the bank 2, sensor 1 oxygen sensor if the signal stays high with good wiring.
- Clear the code and re-test.
FAQ
Quick answers
Is it safe to drive with P0152?+
Can I just clear P0152?+
Related codes
Read & clear P0152 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.