MotorBitP0141: O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
Downstream (post-cat) O2 heater circuit fault on bank 1.
Educational OBD2 information. Confirm on your vehicle with a scan tool. MotorBit can read this code, freeze frame, and live data over an ELM327 adapter.
What P0141 means
The rear oxygen sensor heater failed the circuit monitor.
Why the check engine light comes on
Catalyst monitoring needs a warm rear sensor. The MIL is set even if the car drives fine.
Common causes
- Failed rear O2 heater
- Wiring
- Fuse
Typical symptoms
- MIL with little or no drivability issue
What to do next
- Confirm with a scan, then test heater resistance.
- Do not confuse this with P0420 — they are different faults.
How MotorBit helps
Open MotorBit, connect your ELM327, and read P0141 with freeze frame (RPM, load, temperature, speed at the moment the fault set). Then watch live PIDs and fuel trims instead of replacing parts by guesswork. When the repair is verified, clear the code and re-check monitors.
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FAQ
Is P0141 serious?
Severity is listed as low on this page. Misfire, crank/cam, and communication codes deserve faster attention than a tiny EVAP leak.
Will disconnecting the battery clear P0141?
It may hide the lamp temporarily, but the fault usually returns and you lose freeze-frame evidence. Scan first, then clear after the repair.
Can MotorBit clear P0141?
Yes, after you understand the cause. Clearing without a repair is how the light comes back on the next drive cycle.