P0152: O2 Sensor Circuit High Voltage (Bank 2 Sensor 1)
Can you still drive? Yes, but the rich condition wastes fuel and can damage the catalytic converter. Address this within one to two weeks.
What Does P0152 Mean?
Code P0152 is set when the upstream oxygen sensor on Bank 2 reports a voltage consistently above the normal range, typically over 0.9 volts. This indicates a rich exhaust condition on Bank 2 or a sensor that has shorted internally. The ECU will attempt to lean out the fuel mixture in response, which may cause drivability issues.
Need to read your codes?
An OBD-II scanner lets you read and clear diagnostic trouble codes from your vehicle's computer. Most scanners work with any car made after 1996.
Browse OBD-II Scanners on AmazonCommon Causes
- Faulty O2 sensor stuck reading rich
- Short in O2 sensor signal wiring
- Leaking fuel injector on Bank 2
- High fuel pressure
Symptoms
- Check engine light on
- Rich running on Bank 2
- Black smoke from exhaust
- Poor fuel economy
- Strong fuel odor
Diagnostic Steps
- 1Read and document freeze frame data
- 2Monitor Bank 2 Sensor 1 voltage to confirm stuck-high reading
- 3Check Bank 2 fuel trims for rich compensation
- 4Inspect O2 sensor wiring for shorts to voltage
- 5Test fuel pressure and check injectors for leaks
- 6Replace O2 sensor if confirmed faulty
Recommended Parts & Tools
oxygen sensor
O2 sensor socket
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $60 - $400 |
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Frequently Asked Questions
Can a leaking injector cause P0152?
Yes, a leaking fuel injector on Bank 2 can dump extra fuel into the exhaust, causing a genuinely rich condition that the O2 sensor correctly reports as high voltage.
How do I know if the sensor is bad or the engine is actually running rich?
Check the fuel trims. If the ECU is heavily subtracting fuel on Bank 2, the engine is actually rich. If fuel trims are normal but the sensor reads high, the sensor is likely faulty.
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