O2 Sensor Circuit (Bank 2, Sensor 1)
The P0150 code means the vehicle's onboard diagnostic system has detected: O2 Sensor Circuit (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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Shows real-time O2 sensor readings on your phone. See if the sensor is lazy, stuck, or actually working before spending money.
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Common Symptoms
- Check Engine Light on
- Poor fuel economy
- Rough running
- Rich or lean condition
- Failed emissions
Probable Causes (Ranked by Likelihood)
- Failed Bank 2 upstream O2 sensor Very High
- Wiring fault to Bank 2 sensor High
- Exhaust leak near Bank 2 sensor Moderate
- Sensor heater failure Moderate
Step-by-Step Diagnostic Procedure
-
Identify Bank 2 on your engine (the side without cylinder 1). Locate the upstream O2 sensor on that side.
-
Monitor Bank 2 Sensor 1 voltage: should switch 0.1-0.9V at idle.
-
Compare Bank 1 and Bank 2 fuel trims: if Bank 2 is significantly different, focus diagnosis there.
-
Test heater, wiring, and sensor as with P0130.
Common Fixes by Vehicle
What techs usually find when diagnosing P0150 on specific vehicles — tap your vehicle for the fix and the exact part:
2005-2014 Ford F-150/Expedition/Mustang 4.6L/5.0L/5.4L Easy DIY
Bank 2 sensor 1 (upstream, passenger side on most V8s) malfunction — replace with Motorcraft or Denso OEM. Check for exhaust manifold cracks that let ambient air dilute the reading. Don't use universal-fit sensors.
Labor: 30-45 min2005-2014 GM 5.3L/6.0L LS (Silverado, Tahoe, Yukon) Easy DIY
Bank 2 upstream O2 failure on LS-series truck engines — replace with ACDelco. Confirm no exhaust leak at broken manifold studs (common on 5.3L after 100K). Verify PCM 5V reference is stable.
Labor: 30-45 min2007-2014 Toyota Tundra/Sequoia 5.7L V8 Easy DIY
Bank 2 sensor 1 air/fuel sensor malfunction — replace with Denso A/F sensor only. Aftermarket A/F sensors notoriously fail on Toyota V8 applications within 20K miles.
Labor: 30-45 minFrequently Asked Questions
How do I find Bank 2 Sensor 1 on a V8?
On most American V8s (Ford, GM, Dodge), Bank 2 is the passenger side. Sensor 1 is the sensor before the catalytic converter on that side -- usually located on the exhaust manifold or just downstream of it.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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