Code Definition

P1190 — Heated Oxygen Sensor 1 bank 1 reference voltage out of range

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

About P1190

P1190 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 P1190 is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour; 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.

P1190 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 is a wideband type, and the Engine Control Module (ECM) supplies it with a reference or bias voltage, sometimes described as a virtual ground, on which the Nernst measuring cell sits and against which the oxygen pump current is regulated. Unlike the open circuit and short circuit codes in this family, DTC P1190 is a range fault. The reference line is still present and still carrying voltage, but the value the ECM measures sits outside the window it expects, which is the signature of a partial fault rather than a total one. High resistance in the circuit, a par...

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