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Code

P0150

Emissions

Oxygen sensor circuit malfunction — Bank 2 Sensor 1

The bank 2 upstream oxygen sensor circuit has a fault.

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Most likely causes

Faulty O2 sensor
Wiring fault
Exhaust leak

Symptoms you may notice

Check engine light
Worse economy

Checks to run

Test sensor heater and signal
Inspect wiring
Check for exhaust leaks

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 heater circuit malfunction — Bank 1 Sensor 2

Oxygen sensor circuit low voltage — Bank 1 Sensor 1

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