P0152
Medium SeverityO2 Sensor Circuit High Voltage (Bank 2, Sensor 1)
Emissions System
P0152 — Instant Answer
O2 Sensor Circuit High Voltage (Bank 2, Sensor 1)
Severity: MEDIUM SEVERITY
Meaning: Upstream O2 sensor bank 2 reads too high (rich).
Safe to drive? Usually yes with caution, but confirm root cause before long trips.
Estimated repair cost: $30 - $100
Most common causes:
- 1. Failed O2 sensor (35-45% of cases)
- 2. Leaking fuel injector on bank 2 (10-25% of cases)
- 3. High fuel pressure (10-25% of cases)
Symptoms
- ⚠️Rich running on bank 2
- ⚠️Black smoke from one side
- ⚠️Fuel smell
Common Causes
How to Diagnose P0152
- 1Monitor O2 sensor voltage
- 2Check fuel trim bank 2
- 3Inspect injectors for leaks
- 4Replace sensor
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Related Resources
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Open the exact repair flow most commonly associated with P0152 on this vehicle.
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Related Codes
General fault with the upstream O2 sensor on bank 2 of a V-engine.
Bank 2 is running rich. If P0172 is also present, look for shared causes like fuel pressure or MAF sensor.
Upstream O2 sensor on bank 2 is stuck low, reading lean.
Frequently Asked Questions
- Can a leaking injector cause P0152?
- Yes — a leaking injector on bank 2 adds extra fuel, causing a real rich condition the O2 sensor correctly detects.
- How to tell if it is the sensor or injector?
- Check fuel trim: if the ECM is trimming fuel down heavily on bank 2, it is a real rich condition (injector). If trims are normal, the sensor is lying.
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Author & Review
Written by AllOEMManuals Editorial Team. Reviewed by ASE-certified technicians and updated with factory-reference checks for fitment-sensitive steps.
This guide was drafted with AI assistance and reviewed for accuracy by a human editor.
Last updated: 2026-05-07