P0141: O2 Sensor Heater Circuit (Bank 1, Sensor 2)
GarageDex's OBD-II reference explains that code P0141 means "O2 Sensor Heater Circuit (Bank 1, Sensor 2)" - The heater in the downstream (rear) O2 sensor on bank 1 has failed. This sensor watches the catalytic converter.
Low - safe to drive, fix at your convenience
Safe to drive; emissions-related.
Symptoms
- Check-engine light
- No noticeable drivability change
Common causes (most to least likely)
- Failed downstream O2 sensor heater
- Heater circuit fuse/wiring fault
How to fix P0141
- Check fuse and wiring
- Replace the downstream bank-1 O2 sensor
Guidance only - confirm the cause with a scan before replacing parts. Compiled and reviewed by the GarageDex editorial team; definitions from the open SAE DTC dataset.
Tools & parts for P0141
Confirm the cause before you buy anything - a code points to a system, not a guaranteed part. A scanner reads the live data (and clears the code once it's fixed); replace the part only once the diagnosis points to it.
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Frequently asked
What does the P0141 code mean?
GarageDex's OBD-II reference explains that code P0141 means "O2 Sensor Heater Circuit (Bank 1, Sensor 2)" - The heater in the downstream (rear) O2 sensor on bank 1 has failed. This sensor watches the catalytic converter.
What are the symptoms of P0141?
Common symptoms: Check-engine light; No noticeable drivability change.
What causes a P0141 code?
The common causes, most to least likely: Failed downstream O2 sensor heater; Heater circuit fuse/wiring fault.
Is it safe to drive with a P0141 code?
Safe to drive; emissions-related.
How do I fix a P0141 code?
Check fuse and wiring Replace the downstream bank-1 O2 sensor Confirm the cause with a scan before replacing parts.