Code Definition

P1182 — Heated Oxygen Sensor 1 bank 1 reference voltage shorted to ground

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

About P1182

P1182 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 P1182 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.

P1182 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

The bank 1 upstream lambda sensor on these engines is a wideband type, and the Engine Control Module (ECM) supplies it with a reference or bias voltage, often described as a virtual ground, on which the Nernst measuring cell sits and against which the oxygen pump current is regulated. That reference is what allows a single sensor to report air fuel ratio across a broad range in both the rich and the lean direction. DTC P1182 is stored when the ECM detects the reference voltage circuit for bank 1 sensor 1 shorted to ground, so the bias it is trying to hold on that line is being dragged down and...

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