The basic role of a Volkswagen Passat Ignition Coil is to convert the soft and harmless 12 volts into the electric jolt required to set off each and every spark plug. It does this by putting two copper windings surrounding an iron core, with the thick primary winding connected to the 12-volt circuit and the thin secondary winding containing thousands of loops that induce a voltage of up to approximately 40,000 volts when the magnetic field is reversed. In early Volkswagen sedans, that single coil was also applied to pass that surge through a distributor, but on more recent Passat models it was replaced with more modern designs. The older single-coil design operated each cylinder in series through long plug wires, whereas the distributorless waste-spark coil packs operate a pair of coils at the same time, one feeding a compression cycle and the other an exhaust cycle. Recent coil-on-plug or coil-near-plug models mount an Ignition Coil on or nearly on every spark plug, eliminating high-tension leads completely and increasing timing precision. Regardless of the style, heat, vibration, or expanded plug gaps may crack insulation or increase resistance, causing a Volkswagen engine to stutter, idle roughly, or trigger a check-engine light. A single-coil system pulls the car fully to a stop when the coil goes dead, and the result of a bad coil in a pack or an individual COP unit is to cut off one cylinder, producing imprecise running and incomplete combustion. Simple checkups using a volt-ohm meter enable drivers to check the resistance of the coil against factory standards and decide whether a new Volkswagen Passat Ignition Coil is required.
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