P0141

Get Serviced SoonFix: Low — can wait, but don't ignore

O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2) — Post-cat O2 sensor heater fault.

Dashboard light triggered

Check Engine Light

What to do

Replace the downstream O2 sensor. Lower priority than upstream sensor issues.

Common causes

Failed downstream O2 sensor
Wiring issue

Estimated repair cost

$100–$300

Exact cost depends on the cause, your vehicle, and labor rates in your area.

What to tell your mechanic

Use this script so you sound informed and get a clear diagnosis before agreeing to repairs:

“Code P0141, O2 heater bank 1 sensor 2. I'd like to replace the sensor — can you confirm the wiring is good first?”

About the Check Engine Light

Code P0141 triggers the Check Engine Light. Indicates an issue with the engine or emissions system. Could range from a loose gas cap to a serious engine misfire.

Read full Check Engine Light guide

Frequently asked questions

What does OBD code P0141 mean?: O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2) — Post-cat O2 sensor heater fault.
What dashboard light does P0141 trigger?: P0141 triggers the Check Engine Light.
How serious is P0141?: Severity: yellow. Fix priority: Low — can wait, but don't ignore.
How much does it cost to fix P0141?: Repair costs typically range from $100–$300. The exact cost depends on the root cause and your vehicle.

These codes also trigger the Check Engine Light: