TorqueMech OBD Code Guide
P0130 - O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)
An oxygen sensor circuit issue was detected.
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Code Overview
An oxygen sensor circuit issue was detected.
Common Causes
- Failing upstream oxygen sensor on bank 1 sensor 1
- Damaged wiring or poor terminal contact in the sensor circuit
- Exhaust leak ahead of the sensor
- Rich or lean running condition affecting the signal
Symptoms
- Check-engine light with unstable fuel trims
- Rough idle or light hesitation
- Reduced fuel economy
Diagnostic Steps
- Check for fuel-trim, misfire, or exhaust-leak issues first
- Inspect the bank 1 sensor 1 harness near the exhaust for damage
- Watch the upstream O2 sensor switch activity on the scan tool
- Verify power, ground, and signal integrity before replacing the sensor
Repair Difficulty
Moderate
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