P0141 on a Lexus: Causes, Fixes & Repair Cost

🟢 Low severity · drivable

The car remains drivable because the heater only speeds up sensor warm-up, so ride and performance are unchanged.

What P0141 means on a Lexus

On a Lexus, P0141 indicates the heater circuit in the bank 1 downstream oxygen sensor has failed. Like other Toyota-built vehicles, the downstream sensor only monitors the converter, so the car continues to drive normally.

Is P0141 common on Lexuss?

Higher-mileage Lexus models such as the RX, ES, and IS see this code when the Denso-made rear sensor heater wears out. Using a quality Denso or OEM replacement keeps the fix reliable and matches what Lexus installs from the factory.

Commonly reported on: RX, ES, IS, GX.

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 sensor
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 downstream oxygen sensor with a Denso or OEM unit	Yes	$90–260
Repair damaged wiring or the sensor connector	Yes	$30–150
Have a shop replace the sensor with labor	Mechanic	$170–420