Code Definition

P1183 — Heated Oxygen Sensor 1 bank 1 reference voltage shorted to positive

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

About P1183

P1183 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 P1183 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.

P1183 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 wideband oxygen sensor is measured against a fixed reference, or virtual ground, voltage applied by the Engine Control Module (ECM), commonly around 2.5V. Both the Nernst cell voltage and the pump cell current are read relative to that reference, so its accuracy underpins the entire lambda calculation. DTC P1183 is set when the ECM detects that the reference voltage line for bank 1 sensor 1 has been pulled up by an external supply, meaning the reference is now sitting well above its correct value and every measurement made against it is invalid. The most common source of th...

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