P0141: O2 Sensor Heater Circuit (Bank 1, Sensor 2)
P0141 affects the O2 sensor after the catalytic converter. The fix is almost always sensor replacement.
Severity: low · System: Powertrain · Safe to drive: usually, short-term. Low urgency, but ignoring it can mask a real catalyst issue.
Symptoms
- Check engine light
- Minor MPG dip
Common causes
- Failed downstream O2 sensor heater
- Fuse or wiring
Fair repair prices
| Downstream O2 sensor replacement | $180–$400 |
|---|---|
| Fuse / wiring repair | $60–$200 |
Ranges are US market averages (parts and labor). If your shop's quote is above the high end, ask for a line-item breakdown or run it through the invoice checker.
Other codes
- P0300 — Random / Multiple Cylinder Misfire Detected
- P0301 — Cylinder 1 Misfire Detected
- P0420 — Catalyst System Efficiency Below Threshold (Bank 1)
- P0430 — Catalyst System Efficiency Below Threshold (Bank 2)
- P0171 — System Too Lean (Bank 1)
- P0174 — System Too Lean (Bank 2)
- P0442 — Evaporative Emission Control System Leak (Small)
- P0455 — Evaporative Emission Control System Leak (Large)