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Code

P0141

Emissions

Oxygen sensor heater circuit malfunction — Bank 1 Sensor 2

The downstream O2 sensor heater circuit has a fault.

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Most likely causes

Faulty O2 sensor heater
Blown fuse
Wiring fault

Symptoms you may notice

Check engine light

Checks to run

Test heater circuit resistance
Check fuse and wiring

Tools you may need

Multimeter OBD-II scanner

Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.

Related codes in Emissions

Catalyst system efficiency below threshold — Bank 1

Oxygen sensor circuit malfunction — Bank 1 Sensor 1

Oxygen sensor heater circuit malfunction — Bank 1 Sensor 1

Oxygen sensor circuit low voltage — Bank 1 Sensor 1

Oxygen sensor no activity detected — Bank 1 Sensor 1

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