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P1180 on BMW vehicles means the downstream oxygen sensor on Bank 1 (Sensor 2) is switching too slowly between rich and lean readings. The engine computer expects this post-catalytic converter sensor to react quickly to changes in exhaust oxygen content, and it has detected a lazy or sluggish response that exceeds the calibrated time limit.
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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