P0137Alfa-romeo GiuliettaYears: 1996 - 2026
O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2)
Reviewed by ASE Certified Technician
What does this mean?
Code P0137 indicates the downstream O2 sensor on Bank 1 is reading persistently low voltage.
Disclaimer: This diagnostic code is part of the standard OBD2 system and can apply to Alfa-romeo Giulietta 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
Exhaust leak before oxygen sensor
Damaged, chafed, or broken wiring harness
Symptoms to Watch For
- Check Engine Light is illuminated
- Decreased fuel economy
- Failed emissions test