P0141
O2 Sensor Heater Circuit Bank 1 Sensor 2
Emissions / oxygen sensor
Generic OBD-II
Medium
What it means
P0141 means the heater circuit in the downstream oxygen sensor (bank 1, sensor 2 — after the catalytic converter) isn't drawing the current the ECM expects. That heater just brings the sensor up to temperature quickly; the code does not affect how the engine runs or starts. Most often the sensor's internal heater has failed, though a blown fuse or bad wiring can cause it too.
Medium
Can I keep driving? Yes — the car drives normally; this affects the downstream sensor's heater, not how the engine runs, but it will fail emissions until fixed.
Common symptoms
What you'll notice
- Check-engine light on
- Usually no change in how the car drives
- Emissions readiness monitor won't complete (fails a smog test)
Common causes
Most likely first
- Failed heater element inside the downstream (sensor 2) O2 sensor — most commonLikely
- Blown fuse or open/shorted wiring in the heater circuitCommon
- Corroded or loose sensor connectorCommon
- Faulty heater ground or driver in the ECM (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and confirm the code is for bank 1, sensor 2 (the sensor after the catalytic converter).
- Check the O2 heater fuse and inspect the sensor connector for corrosion or a loose pin.
- Measure the heater element's resistance and its supply voltage and ground against spec.
- If wiring and power are good, replace the downstream O2 sensor — the heater is usually the failure.
- Clear the code and allow a full drive cycle for the monitor to re-run.
FAQ
Quick answers
Is it safe to drive with P0141?+
Yes. The bank 1 sensor 2 heater only speeds the sensor to operating temperature for emissions monitoring; the engine runs and drives normally. Fix it to pass emissions.
Can I just clear P0141?+
It returns once the heater circuit fails its self-test again, usually within a drive cycle or two. The sensor or wiring needs repair.
Related codes
Often seen with P0141
Read & clear P0141 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX