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The glow plug unit in the BMW X5 E53 is placed on the passenger side of the engine beneath the exhaust manifold in the engine compartment. There is a wire connecting the battery to the glow plug module, drawing 25 amps of electricity. Signs of glow plug failure in a BMW can include emissions of white or black smoke from the exhaust, difficulties in starting, rough idling, misfires, stalling, and hard starting. Glow plugs are vital components of a diesel engine, responsible for heating up fuel and air to the right temperatures for combustion within the motor. They work as a heating element that impacts both performance and fuel efficiency. The typical cost for replacing glow plugs ranges from $600 to $800, covering parts and labor.
The glow plug control unit of the BMW X5 E53 can be found inside the relay and fuse box located in the engine compartment.