OBD-II Code · Sensors
P0141
O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)
Severity
low
Lowest on our scale. Fix it when convenient.
Can you drive it
Only if running normally
A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety.
Indicative cost (USD)
$150–$350
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
Downstream O2 sensor heater failure, bank 1.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then work the likely-causes list in the order shown.
That order is what a shop checks first for this code — wiring and connections before the component they run to, because a connector costs nothing to inspect and is a common answer.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
- Slow sensor warm-up
Likely causes
- Failed O2 heaterMost common
- Wiring
- Blown fuse
Read the full diagnostic procedureP0141 is a heater-circuit fault on bank 1 downstream.
P0141 is a heater-circuit fault on bank 1 downstream.
Same diagnostic as P0135 upstream but for the post-cat sensor
ohm the heater pins (6-15 ohms cold narrow-band, 2-4 ohms wideband), verify B+ at the heater feed pin key-on, verify the ECU is providing a pulsed ground on the heater control pin. Downstream sensors fail their heaters MORE often than upstream because they live in a harsher thermal environment — sitting just downstream of a cat that hits 800°C+ under load, then cooling rapidly when the engine shuts off. The heater coil's repeated thermal expansion eventually opens it up. Cheapest-first: confirm the fuse that feeds the O2 heaters hasn't blown (often shared across multiple sensors on one fuse, so a shorted heater on ONE sensor can blow the fuse and set P0141 + P0135 + P0155 simultaneously). If the fuse is good and the heater ohms open, replace the sensor.
Vehicle-specific patterns2003-2008 Toyota Corolla / Matrix 1ZZ-FE throws P0141 around 110k-130k routinely.
- 2003-2008Toyota Corolla / Matrix 1ZZ-FE throws P0141 around 110k-130k routinely.
- 2005-2010Chrysler 300 / Charger 5.7L Hemi sets P0141 from TIPM relay failures — same TSB as P0135.
- 2007-2013Chevy Equinox / Terrain 2.4L Ecotec throws P0141 from corroded downstream connectors (the sensor sits right in the wheel-well spray path).
- 2009-2015Subaru Forester / Outback FB25 sets P0141 from a chafed downstream harness against the rear differential mount bolt. Cost band: $150-$350 for sensor; up to $700 if TIPM is involved; under $20 if it's just a fuse.
Look up another code
P0141 — frequently asked
What does a P0141 code mean?
Downstream O2 sensor heater failure, bank 1.
What causes a P0141 code?
Common causes: Failed O2 heater; Wiring; Blown fuse.
What are the symptoms of a P0141 code?
Typical symptoms: Check engine light; Slow sensor warm-up.
Is it safe to drive with a P0141 code?
Only if running normally. A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety. Estimated repair: $150-$350.
How do I diagnose a P0141 code?
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed. 1. Note every code that is set, not just this one. 2. Read the freeze frame — the conditions the fault was recorded under. 3. Confirm the fault is current rather than history. 4. Then work the likely-causes list in the order shown.
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