Code Definition

P1110 — O2S Heating Circuit Bank 2 Sensor 2 Short To B+

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Audi

About P1110

P1110 is a manufacturer-specific powertrain diagnostic trouble code recorded for Audi vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1110 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit; a bank-specific fault, meaning it applies only to one cylinder bank of a multi-bank engine; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1110 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

This fault code indicates that the heating circuit for the downstream oxygen sensor (Bank 2, Sensor 2) has a short to battery voltage (B+). The Engine Control Module (ECM) monitors the oxygen sensor heater circuit to ensure it functions correctly. If the circuit detects excessive voltage due to a short to power, the ECM sets this code. A malfunctioning heater circuit can prevent the sensor from reaching optimal operating temperature, leading to incorrect emissions readings and potential drivability issues.

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