P0141 on a Hyundai: Causes, Fixes & Repair Cost

🟢 Low severity · drivable

The car stays drivable because the rear sensor heater only affects warm-up speed, not engine performance.

What P0141 means on a Hyundai

On a Hyundai, P0141 indicates the heater circuit in the bank 1 downstream oxygen sensor isn't working. The downstream sensor checks the catalytic converter and doesn't control fuel trim, so the car keeps running normally with the light on.

Is P0141 common on Hyundais?

Hyundai sees this code most on higher-mileage models like the Elantra, Sonata, and Tucson as the rear sensors age. Replacement rear sensors for Hyundais are reasonably priced, and the sensor is usually easy to reach under the car.

Commonly reported on: Elantra, Sonata, Tucson, Santa Fe.

Symptoms

Check engine light is on
Emissions test may fail
Slightly worse fuel economy
No drivability issues

Common causes

most common: Heater element burned out in the rear sensor
common: Blown heater circuit fuse
common: Damaged wiring or connector under the car
less common: Corrosion from road salt or moisture in the connector

How to fix it

Fix	DIY?	Typical cost
Test the heater circuit with a multimeter to confirm the fault	Yes	$10–60
Replace the bank 1 downstream oxygen sensor	Yes	$70–200
Repair the wiring or connector feeding the sensor	Yes	$20–120
Have a shop replace the sensor including labor	Mechanic	$140–350