OBD-II Code · Sensors
P0150
O2 Sensor Circuit Malfunction (B2S1)
Severity
medium
Worth booking. It costs fuel, emissions or comfort until it is fixed.
Can you drive it
Only if running normally
A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety.
Indicative cost (USD)
$150–$400
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
Bank 2 upstream O2 sensor circuit fault.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then work the likely-causes list in the order shown.
That order is what a shop checks first for this code — wiring and connections before the component they run to, because a connector costs nothing to inspect and is a common answer.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
- Poor fuel economy
Likely causes
- Failed sensorMost common
- Wiring
- Exhaust leak
Read the full diagnostic procedureP0150 is the bank 2 mirror of P0130 — the upstream sensor on bank 2 (B2S1) is producing an implausible signal or no signal at all.
P0150 is the bank 2 mirror of P0130 — the upstream sensor on bank 2 (B2S1) is producing an implausible signal or no signal at all. V6/V8 and flat-engine only; doesn't apply to inline-4s.
CRITICAL
get the FSM bank diagram before you touch anything. On transverse V6/V8 platforms (Toyota 2GR-FE, Honda J35, Chrysler 3.6L Pentastar, Ford 3.5L Cyclone), bank 1 is typically the REAR bank closest to the firewall and bank 2 is the front bank; on longitudinal applications (most pickup trucks, BMW, Mercedes RWD) bank 1 is the right/passenger side. Replacing the wrong sensor is the #1 mistake on bank-2 codes. Same diagnostic ladder as P0130: connector inspection for corrosion/oil contamination, signal-wire scope test for switching (0.1-0.9V narrow-band at 8+ cross-counts per 10s, or 1.5-4.5V steady on wideband AFR), heater resistance check (6-15Ω narrow-band cold).
Vehicle-specific patterns2007-2014 Toyota Camry V6 / Avalon / RX350 with the 2GR-FE — bank 2 is the FRONT (radiator side), and the front upstream sensor is the easy one to re…
- 2007-2014Toyota Camry V6 / Avalon / RX350 with the 2GR-FE — bank 2 is the FRONT (radiator side), and the front upstream sensor is the easy one to reach but the one customers often replace by mistake when bank 1 (rear, behind the intake) is the actual problem.
- 2005-2012Honda Pilot / Odyssey / Ridgeline J35 — bank 2 is front; throws P0150 when the front exhaust manifold gasket fails.
- 2009-2017Chrysler 300 / Charger / Challenger 5.7L Hemi — longitudinal, bank 2 is driver side; throws P0150 from the same TIPM issues that hit P0135.
- 2011-2019Ford F-150 3.5L EcoBoost — longitudinal, bank 2 is passenger side; P0150 often appears after a turbo-side coolant leak migrates onto the sensor. Cost band: $200-$500 for sensor + labor; access on rear-bank V6 transverse platforms can push labor up 1-2 hours.
Look up another code
P0150 — frequently asked
What does a P0150 code mean?
Bank 2 upstream O2 sensor circuit fault.
What causes a P0150 code?
Common causes: Failed sensor; Wiring; Exhaust leak.
What are the symptoms of a P0150 code?
Typical symptoms: Check engine light; Poor fuel economy.
Is it safe to drive with a P0150 code?
Only if running normally. A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety. Estimated repair: $150-$400.
How do I diagnose a P0150 code?
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed. 1. Note every code that is set, not just this one. 2. Read the freeze frame — the conditions the fault was recorded under. 3. Confirm the fault is current rather than history. 4. Then work the likely-causes list in the order shown.
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