Code Definition

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

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

About P1105

P1105 is a manufacturer-specific powertrain diagnostic trouble code recorded for Volkswagen 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 VW vehicles, the P1105 fault code indicates a specific issue with the O2 Sensor Heating Circuit for Bank 1 Sensor 2, characterized by a short to B+ (battery positive voltage). This code is set when the Engine Control Module (ECM) detects that the heating circuit of the downstream oxygen sensor (located in Bank 1, after the catalytic converter) has an electrical short to the positive battery voltage. This condition can prevent the sensor from reaching the proper operating temperature, thereby affecting its ability to accurately monitor the oxygen levels in the exhaust gases.

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