Code Definition

P1105 — O2S Heating Circuit Bank 1 Sensor 2 Short To B+

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

About P1105

P1105 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 P1105 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.

P1105 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

For Audi and Volkswagen vehicles, DTC P1105 indicates a fault in the oxygen sensor (O2S) heating circuit for Bank 1 Sensor 2, identified as a short to B+ (battery positive voltage). The code sets when the Engine Control Module (ECM) detects that the heater circuit of the downstream oxygen sensor, located after the catalytic converter on the bank containing cylinder 1, is shorted to positive battery voltage instead of being controlled cleanly by the ECM. This prevents the ECM from regulating the heater correctly and can stop the sensor reaching proper operating temperature. Because Sensor 2 is ...

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