The BMW X5 Ignition Coil converts the battery's meager 12 volts into the tens of thousands necessary to create each spark at each plug, keeping combustion alive and the SUV going. Inside its plastic or epoxy case are primary and secondary copper windings encircling an iron core. The primary one creates a magnetic field, and when current is cut, the collapsing magnetic field surges through the secondary one to create 15,000 to 40,000 volts that leap the plug gap. Early versions of the X5 applied a single Ignition Coil with a distributor. Later generations had coil packs in waste spark configurations, and the recent generation has the dedicated coil-on-plug Ignition Coil on top of each cylinder, with wires trimmed and BMW reliability at an all-time high. The primary differences between these styles include coil count and routing, with distributor systems using a single high tension lead, waste spark using paired cylinders, and coil-on-plug providing each cylinder with its very own compact Ignition Coil for fast voltage delivery. Periodic checks of every Ignition Coil keep the BMW engine smooth and help an X5 avoid cascading faults. When a coil grows weak, misfires, rough idle, or poor mileage alert the BMW driver that the X5 engine demands attention.
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