P0131Volkswagen GolfYears: 1996 - 2026
O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1)
Reviewed by ASE Certified Technician
What does this mean?
Code P0131 indicates the upstream O2 sensor on Bank 1 is reading a persistently low voltage, suggesting a lean condition.
Disclaimer: This diagnostic code is part of the standard OBD2 system and can apply to Volkswagen Golf models manufactured from 1996 to 2026. However, please note that the presence of this specific code depends on your vehicle's exact engine configuration, options, and production year.
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Common Causes
Faulty oxygen (O2) sensor
Vacuum leak in intake system
Exhaust leak before oxygen sensor
Clogged or faulty fuel injector
Symptoms to Watch For
- Check Engine Light is illuminated
- Decreased fuel economy
- Rough or unstable idle
- Hesitation or stumble during acceleration