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Code

P0137

Emissions

O2 sensor circuit low voltage — Bank 1 Sensor 2

The downstream O2 sensor voltage is too low.

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Most likely causes

Faulty sensor
Wiring short
Exhaust leak

Symptoms you may notice

Check engine light

Checks to run

Test sensor voltage
Inspect wiring

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

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Oxygen sensor heater circuit malfunction — Bank 1 Sensor 2

Oxygen sensor circuit low voltage — Bank 1 Sensor 1

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