P0141 - O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

P0141 means the heater circuit for the downstream oxygen sensor on bank 1 is not working as expected. The sensor may be bad, but a blown fuse, poor power supply, ground issue, or damaged wiring can set the same code.

Code Overview

P0141 means the heater circuit for the downstream oxygen sensor on bank 1 is not working as expected. The sensor may be bad, but a blown fuse, poor power supply, ground issue, or damaged wiring can set the same code.

Common Causes

• Failed heater element in bank 1 sensor 2
• Damaged wiring or connector near the sensor
• Blown fuse or missing heater power supply
• High resistance in the heater control circuit

Symptoms

• Check-engine light with no major drivability complaint
• Oxygen-sensor monitor takes longer to run
• Failed emissions readiness or inspection

Diagnostic Steps

1. Inspect the downstream sensor wiring and connector away from the hot exhaust
2. Verify heater-circuit power, ground, and related fuse protection
3. Check connector fit and terminal tension at bank 1 sensor 2
4. Confirm the heater fault with scan data or meter checks before replacing parts

Repair Difficulty

Moderate

General difficulty estimate for the most common repair path.

Likely Repairs & Cost Guides

Use test results to confirm the fault before pricing the repair.

Related OBD Codes

Browse the closest code-family pages when the same fault pattern often shows up nearby.

Next Steps

Move from the code to a diagnosis path, then into repair pricing once the fault is confirmed.