P0141 O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 2

P0141 points to a heater-circuit malfunction for bank 1 sensor 2. The downstream oxygen sensor heater circuit failed its electrical or warm-up monitor.

Code details

Generic OBD-II · P0

System: Fuel / Air
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace the downstream sensor until the heater circuit has been tested; a wiring or fuse issue can set the same code.

Symptoms of P0141

Check-engine light.
No obvious change in drivability.
Possible effect on catalyst-monitor readiness.

Common causes of P0141

A failed downstream oxygen-sensor heater.
A blown fuse feeding the heater circuit.
Wiring or connector faults at the sensor.
An aged downstream oxygen sensor.

Useful checks before replacing parts

Inspect heater fuse, power feed, control circuit, ground path, connector terminals, and exhaust-heat damage.
Check whether other oxygen-sensor heater codes share the same supply circuit.
Confirm sensor replacement only after circuit integrity and service-information tests support it.

Related OBD-II codes

These nearby fuel / air entries can help compare wording and pin down the fault area.