O2 Sensor Circuit High Voltage (Bank 2, Sensor 1)
The P0152 code means the vehicle's onboard diagnostic system has detected: O2 Sensor Circuit High Voltage (Bank 2, Sensor 1). This is a serious severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- easy
- Estimated cost
- $50-$200
Test O2 sensor voltage (should fluctuate 0.1-0.9V). Do not replace a $150 sensor without confirming it is actually bad first.
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Common Symptoms
- Check Engine Light on
- Rich running on Bank 2
- Poor fuel economy
- Possible black smoke
Probable Causes (Ranked by Likelihood)
- Stuck-rich upstream O2 sensor on Bank 2 Very High
- Genuine rich condition on Bank 2 Moderate
- Short to voltage in signal wiring Moderate
- Contaminated sensor Low
Step-by-Step Diagnostic Procedure
-
Monitor Bank 2 Sensor 1 voltage. Stuck above 0.7V constantly indicates a fault.
-
Check Bank 2 fuel trim (LTFT/STFT). If very negative, the engine is genuinely running rich on Bank 2.
-
Investigate Bank 2 fuel delivery: injectors, fuel pressure regulator.
-
Replace sensor if fuel trims are normal but O2 reads constantly high.
Frequently Asked Questions
If P0132 is Bank 1 and P0152 is Bank 2, can both appear together?
Yes. If both upstream sensors read high simultaneously, the engine is genuinely running rich on both banks. Check the MAF sensor, fuel pressure regulator, and injectors.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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