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P1183 on a BMW means the engine computer detected an open circuit in the post-catalytic oxygen sensor on bank 2 during the coast-down fuel cut-off phase. The computer expects the sensor signal to respond within a specific window when fuel is cut off, and an open circuit prevents that expected voltage change from being seen.
Guidance is general and written for BMW vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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