P0152
O2 Sensor Circuit High Voltage (Bank 2 Sensor 1)
The PCM sees the front oxygen sensor on bank 2 stuck at a high-voltage reading. That usually means the sensor is reporting a rich condition, the circuit is shorted high, or the engine is actually running too rich on that bank. Because it is the upstream sensor, it can skew fuel control directly.
- SEV
- 3/5
- DRIVE
- CAUTION
- DIY
- $20-$250
- SHOP
- $120-$650
Quick answer
AI-CITATION READYWhat it means
Can you drive with it?
Most common causes
- Faulty or biased-high Bank 2 Sensor 1 oxygen sensor
- Engine running rich on bank 2 from leaking injector or excessive fuel pressure
- Damaged signal wiring or connector causing a high-voltage reading
Typical repair cost
DIY usually runs $20-$250. Typical shop repair lands around $120-$650, depending on the root cause.
01 / Definition
P0152 means the PCM detected a high-voltage condition in the signal circuit for Bank 2 Sensor 1, the upstream oxygen sensor on the bank opposite cylinder 1. A high reading can come from a sensor biased rich, signal wiring shorted to voltage, fuel-system overfueling, leaking injectors, or contaminated sensor operation. The code points to sensor or mixture behavior, not just the sensor alone.
02 / Drive status
With caution. The vehicle may still drive, but a rich-running condition can waste fuel, foul plugs, and overheat the catalytic converter. It should be diagnosed soon rather than cleared and ignored.
03 / Symptoms
- Check engine light on
- Poor fuel economy
- Fuel smell from the exhaust
- Rough idle or loaded-up running
- Failed emissions test
04 / Causes
| 1 | Faulty or biased-high Bank 2 Sensor 1 oxygen sensor | high |
|---|---|---|
| 2 | Engine running rich on bank 2 from leaking injector or excessive fuel pressure | high |
| 3 | Damaged signal wiring or connector causing a high-voltage reading | medium |
| 4 | Contaminated sensor, poor ground, or heater issue affecting sensor behavior | medium |
| 5 | PCM interpretation or control fault | low |
05 / Diagnostic sequence
- 01Verify P0152 and check for related fuel-trim, misfire, injector, or heater codes.
- 02Review live data for Bank 2 Sensor 1 and compare fuel trims between both banks.
- 03Inspect the Bank 2 Sensor 1 connector and wiring for oil contamination, corrosion, heat damage, or shorted wiring.
- 04Check for signs of true rich running such as black exhaust soot, fuel smell, or fouled plugs.
- 05Test fuel pressure and injector leakage if bank 2 appears to be overfueling.
- 06Verify heater-circuit and ground integrity so the sensor can operate correctly.
- 07Replace the sensor only after wiring and mixture problems are checked.
06 / Repairs
| 1 | Repair signal-circuit wiring, connector, or ground faults at Bank 2 Sensor 1 | $20-$150 |
|---|---|---|
| 2 | Correct rich-running causes such as leaking injectors or excessive fuel pressure | $100-$500 |
| 3 | Replace the Bank 2 Sensor 1 oxygen sensor if testing confirms it is biased high or contaminated | $70-$280 |
| 4 | Repair heater-circuit or PCM-related issues if they are affecting upstream sensor behavior | $20-$300 |
07 / Related codes
08 / FAQ
Does P0152 mean the sensor itself is bad?
Not always. A rich-running engine or signal-circuit fault can also hold the voltage high.
Can a leaking injector cause P0152?
Yes. Extra fuel on bank 2 can drive the upstream sensor rich and trigger this code.
Is P0152 hard on the catalytic converter?
It can be if the engine is actually running rich, because excess fuel can overheat and damage the converter.
09 / Source and method
- DATA BASIS
- OBD-II REFERENCE + OBD2.HELP
- METHOD
- STATIC VALIDATION
- SAFETY
- INFORMATIONAL
This page combines OBD-II diagnostic reference data with OBD2.help generated diagnostic guidance for code meaning, likely causes, and repair direction.
Publishing uses deterministic schema and build validation, plus manual spot checks on representative pages before release.
Safety-critical diagnosis and repairs should be confirmed with a qualified mechanic, especially when the vehicle is misfiring, overheating, or losing power.