Code Definition

P1199 — O2S Heater Circuit Bank 2 Sensor 2 Electrical Malfunction

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

About P1199

P1199 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 P1199 is stored, the module has detected 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.

P1199 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

Bank 2 sensor 2 is the post catalyst oxygen sensor fitted downstream of the catalytic converter on the cylinder bank that does not contain cylinder number 1. Its role is to report the oxygen content of the exhaust leaving the converter so the Engine Control Module can compare it against the upstream sensor and judge converter efficiency, rather than to trim fuel delivery directly. Positioned well down the exhaust system it runs relatively cool, so its integral resistive heater must bring the element to operating temperature quickly and hold it there during idle and light load. The ECM supplies...

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