P1355 on a BMW indicates that the engine control module (DME) has detected a misfire on cylinder 7 severe enough to protect the catalytic converter by cutting fuel delivery to that cylinder. The DME monitors crankshaft speed fluctuations and, when the misfire rate exceeds a threshold, it disables the fuel injector for that cylinder and stores this code.
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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