P0141 on a Subaru: Causes, Fixes & Repair Cost

🟢 Low severity · drivable

The car remains drivable because the heater only speeds up sensor warm-up, so engine performance is unchanged.

What P0141 means on a Subaru

On a Subaru, P0141 means the heater element in the bank 1 rear oxygen sensor has failed. Because the rear sensor only monitors the converter, the boxer engine keeps running fine, though fuel economy can drop slightly while the light stays on.

Is P0141 common on Subarus?

Subarus with boxer engines, like the Outback, Forester, and Impreza, see this code on higher-mileage cars when the rear sensor heater wears out. On some Subarus the rear sensors sit close to the exhaust and can be a tight reach, so inspect the connector before buying parts.

Commonly reported on: Outback, Forester, Impreza, Crosstrek.

Symptoms

Check engine light is on
May fail an emissions test
Slightly reduced fuel economy
No change in how the car drives

Common causes

most common: Failed heater element inside the rear sensor
common: Blown oxygen sensor heater fuse
common: Damaged wiring or connector near the exhaust
less common: Corrosion in the sensor connector

How to fix it

Fix	DIY?	Typical cost
Check the fuse and test the heater circuit with a multimeter first	Yes	$10–60
Replace the bank 1 rear oxygen sensor	Yes	$80–240
Repair damaged wiring or the sensor connector	Yes	$30–150
Have a shop replace the sensor with labor	Mechanic	$160–400