Code Definition

P1107 — O2S Heating Circuit Bank 2 Sensor 1 Short To B+

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

About P1107

P1107 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 P1107 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.

P1107 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

DTC P1107 indicates that the heating circuit for the upstream oxygen sensor on Bank 2 Sensor 1 has a short to battery voltage (B+). Bank 2 is the bank of the engine that does not contain cylinder 1, and Sensor 1 is mounted before the catalytic converter. The Engine Control Module (ECM) monitors the heater circuit and sets this code when it detects the circuit shorted to positive rather than being switched cleanly by the ECM. A heater that cannot be controlled correctly may stop the sensor reaching operating temperature, delaying closed loop fuel control and leading to inaccurate air fuel mixtu...

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