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Code

P0161

Emissions

O2 sensor heater circuit — Bank 2 Sensor 2

The bank 2 downstream O2 sensor heater has a fault.

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Most likely causes

Blown heater fuse
Faulty sensor heater
Wiring fault

Symptoms you may notice

Check engine light

Checks to run

Test the heater circuit
Check fuse

Tools you may need

Multimeter

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 heater circuit malfunction — Bank 1 Sensor 2

Oxygen sensor circuit low voltage — Bank 1 Sensor 1

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