P0130 – Oxygen sensor circuit – bank 1, sensor 1

P0130 describes a fault in the oxygen-sensor circuit for bank 1, sensor 1. It names the monitored circuit, rather than the component that must be replaced.

Powertrain · Oxygen-sensor feedback

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Meaning and affected system

Sensor 1 is the upstream sensor used for fuel control on bank 1. Its exact location and technology must be confirmed for the engine. Switching and wideband sensors produce different signals, so a universal voltage rule is inappropriate.

Possible causes

Damaged wiring, poor connector contacts or a supply fault can affect the signal.
A damaged or contaminated sensor is another possibility.
Vehicle-specific software guidance can apply to certain applications.

Possible symptoms

The check engine light may appear.
Disrupted oxygen-sensor feedback may accompany increased fuel consumption or poor running; the code does not guarantee these symptoms.

Useful diagnostic considerations

Identify the sensor technology and location using the vehicle details.
Have the connector, wiring and exhaust sealing checked, followed by signal assessment to the manufacturer’s specification.
Include fuel-control codes and applicable manufacturer guidance in the diagnosis.

What this code does not prove

P0130 does not automatically identify a heater fault and is different from P0420. Appropriate electrical and functional tests are needed to narrow down its cause.

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Sources and interpretation

This explanation was editorially cross-checked against the technical sources below. Manufacturer documents concern particular vehicle applications; their thresholds and repair procedures must not be applied universally.

OBD-II code data: OBDex (CC0 1.0) · 196fddffb6ef

Editorial source review: 16 October 2026.

The causes listed are possibilities without a likelihood ranking. This page cannot replace diagnosis of the vehicle. A code alone confirms neither a failed component nor that continuing to drive is safe. The actual condition, warnings, handbook and applicable manufacturer diagnostics determine the next step.