P0150: O2 Sensor Circuit — Bank 2 Sensor 1
What to do
Usually driveable with worse economy. Worth fixing before an emissions test.
What this code means
A signal circuit fault in the upstream oxygen sensor on bank 2, mirroring P0130. Where the same fault appears on both banks simultaneously, look for something they share — a common ground, the reference supply, or an exhaust leak at a shared joint — rather than assuming two sensors failed at once.
Likely causes
Start here
- Faulty oxygen sensor · easy
- Corroded or loose connector · easy
- Exhaust leak before the sensor · moderate
Less common
- Open circuit in sensor wiring · moderate
- Exhaust heat damage to sensor harness · moderate
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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