P0141 (generic)
O2 Sensor Heater Circuit (Bank 1, Sensor 2)
System: Powertrain · Fuel & Air Metering
Severity: minor · Inspection: often fails
Description
Heater circuit malfunction on the post-catalyst sensor. Replace sensor.
Diagnostic snapshot P0141
- Difficulty
- 4/10 — DIY with OBD-II scanner
- Est. repair cost
- $40 – $250 (parts + typical shop labor)
- Common symptoms
- Check engine light (MIL)
- Failed emissions test
Diagnostic workflow
- Confirm P0141 with a live scan — note pending vs stored and freeze frame data.
- Verify reported symptoms: Check engine light (MIL), Failed emissions test.
- Inspect wiring/connectors and related sensors before replacing modules.
- Most likely fixes: Replace oxygen sensor(s).
- Clear codes and road-test; re-scan after two drive cycles if the monitor must set.
Topics
- OBD-II and scan tools (guide)
- Powertrain DTCs (P-prefix) (system)
Related symptoms
- Check engine light (MIL) (weight 0.700)
- Failed emissions test (weight 0.500)
Common fixes (curated)
- Replace oxygen sensor(s) (rank 1)
Related articles
None published for this code yet.
Diagnostic bundle (JSON)
Machine-readable graph: related codes, symptoms, fixes, topics, articles, and curated sources rows. Append &external=1 for optional YouTube / Google CSE hits when API keys are configured (see web/.env.example).