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Why does a BMW automatically stop when driving through water?

1 Answers

LaAustin

09/08/25 6:41am

Due to the auto start-stop function being activated, with unclear underwater road conditions and increased resistance, the vehicle will automatically stop. Below are relevant explanations: 1. Avoid secondary starting: BMW vehicles do not have automatic protection functions after stalling due to water ingress. If the engine stalls from water intake, never attempt to restart it. Instead, call for a rescue tow truck to have the car towed to a 4S shop for repairs. 2. Hazards: If the piston compresses water during upward movement, the engine may suffer from connecting rod deformation, valve distortion, piston fracture, or cylinder wall rupture. If driving through water is unavoidable, carefully assess the water's depth, flow speed, bottom conditions, as well as the width of entry and exit points and road conditions to determine if safe passage is possible.

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