For Mercedes A-Class W176 A250 Genuine Intermotor 4x Ignition Coils. We apologise in advance for any inconvenience caused. 1 - Kit Of 4. Number of Inlets / Outlets. An Ignition Coil is something that transforms a vehicles low battery voltage, into thousands of volts needed to create a spark to ignite the fuel. To prevent misfires, it is essential that your ignition coil is kept in perfect working condition. A non-maintained coil pack can potentially cause fuel wastage.