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Code

P0130

Emissions

Oxygen sensor circuit malfunction — Bank 1 Sensor 1

The 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 fuel economy

Checks to run

Test sensor heater circuit
Check voltage switching
Inspect 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 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

Oxygen sensor no activity detected — Bank 1 Sensor 1

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