What does code P1120 mean on Audi vehicles?
An open circuit has been detected in the heater circuit of O2 sensor Bank 2 Sensor 1.
OBD-II Code Audi
P1120 — Audi — O2 Sensor Heater Circuit Bank 2 Sensor 1 Open
An open circuit has been detected in the heater circuit of O2 sensor Bank 2 Sensor 1.
Common symptoms
- Slow O2 sensor response.
Possible causes
- Open heater circuit.
Initial recommendation
Inspect the O2 sensor heater circuit.
Safety notice
This information is for guidance only. Brand-specific codes may vary by model, year, engine, transmission and vehicle configuration. It does not replace a physical inspection or diagnosis by a qualified mechanic. If the vehicle is unsafe to operate, avoid driving it and seek professional inspection.
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