P0150
Medium SeverityO2 Sensor Circuit (Bank 2, Sensor 1)
Emissions System
P0150 — Instant Answer
O2 Sensor Circuit (Bank 2, Sensor 1)
Severity: MEDIUM SEVERITY
Meaning: General fault with the upstream O2 sensor on bank 2 of a V-engine.
Safe to drive? Usually yes with caution, but confirm root cause before long trips.
Estimated repair cost: $30 - $100
Most common causes:
- 1. Faulty O2 sensor (35-45% of cases)
- 2. Exhaust leak (10-25% of cases)
- 3. Wiring damage (10-25% of cases)
Symptoms
- ⚠️Check engine light
- ⚠️Poor fuel economy
- ⚠️Rough running
- ⚠️Failed emissions
Related Symptoms
Common Causes
How to Diagnose P0150
- 1Inspect wiring and connector
- 2Monitor sensor voltage
- 3Check for exhaust leaks
- 4Replace if faulty
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Related Resources
Repair guides, symptom pages, and wiring diagrams related to P0150.
Related Symptoms
Browse →A check-engine light is a graph entry point into code pages, symptom-specific diagnosis, and the exact repair categories most often associated with those failures.
Rough idle often traces back to ignition, air metering, vacuum leaks, or timing-related faults before it becomes a full misfire complaint.
Exact Vehicle Hubs
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Open the exact vehicle hub for a repair workflow commonly associated with P0150.
Open the exact vehicle hub for a repair workflow commonly associated with P0150.
Open the exact vehicle hub for a repair workflow commonly associated with P0150.
Exact Repair Workflows
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Open the exact repair flow most commonly associated with P0150 on this vehicle.
Open the exact repair flow most commonly associated with P0150 on this vehicle.
Open the exact repair flow most commonly associated with P0150 on this vehicle.
Open the exact repair flow most commonly associated with P0150 on this vehicle.
Open the exact repair flow most commonly associated with P0150 on this vehicle.
Related Codes
Upstream O2 sensor on bank 2 is stuck low, reading lean.
Heater failure in the upstream O2 sensor on bank 2.
General fault with the upstream O2 sensor on bank 1. This sensor monitors exhaust oxygen to control fuel mixture.
Frequently Asked Questions
- Is bank 2 sensor 1 upstream or downstream?
- Sensor 1 is always upstream (before the catalytic converter). Sensor 2 is downstream (after the cat).
- Why does my V6/V8 have bank 2 codes?
- V-engines have two exhaust banks. Bank 2 is the opposite side from cylinder 1.
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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