P0141 — O2 Sensor Heater Circuit (Bank 1, Sensor 2)
Low severityWhat it means
The heater inside the downstream oxygen sensor on bank 1 has failed. This sensor monitors the catalytic converter rather than controlling fuel, so the engine usually runs normally — but the converter cannot be monitored and emissions checks will fail.
Common symptoms
- Check engine light
- No noticeable driveability change in most cases
- Failed emissions inspection
Likely causes
- Failed heater element in the aged sensor
- Blown fuse in the heater circuit
- Damaged wiring or corroded connector
- Rare: engine control unit driver fault
What to check first
- Check the heater circuit fuse
- Inspect wiring and the connector under the car for corrosion or heat damage
- Measure heater resistance at the sensor pins
- Replace the sensor if the heater is open-circuit
Can you keep driving?
Safe to drive; repair it to restore catalyst monitoring and pass inspection.
Frequently asked questions
What is the most common cause of P0141?
The most likely cause is: Failed heater element in the aged sensor. Several other faults can set P0141 as well, so confirm the real cause with live data and the checks above before replacing any parts.
Can I just clear P0141 and keep driving?
Clearing P0141 with an OBD2 scanner turns the warning light off, but if the underlying fault has not been repaired the code will usually come back within a few drive cycles. Fix the cause first, then clear the code to confirm the repair worked.
How serious is P0141?
P0141 is a low-severity code. It rarely affects how the car drives, but it is still worth fixing so the engine runs efficiently and passes an emissions test.
Scan, log and diagnose with MechanicAI
Plug a Bluetooth OBD2 adapter into your car and let MechanicAI turn raw data into answers:
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- And above all — analyze it all with AI for the most likely cause and clear next steps.
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