Coils play a key role in your vehicle's ignition system, helping to spark the engine. These small yet mighty components convert battery voltage into the high voltage needed for the spark plugs to ignite the air-fuel mixture. Without properly functioning coils, your car can experience poor engine performance or difficulty starting. Knowing when to replace them can save you from costly repairs down the road.

What Do Coils Do?

The coil is responsible for generating the electrical energy necessary to fire the spark plugs. It takes the 12 volts from your battery and transforms it into thousands of volts needed to create a spark. This spark ignites the fuel-air mixture in your engine’s cylinders, helping the vehicle run smoothly. Without working coils, your engine can misfire or even fail to start entirely.

Why Do Coils Break Down?

Coils are built to last, but like any part, they can wear out over time. Heat, vibration, and corrosion can cause them to degrade. Over time, the insulation inside the coil can break down, leading to a weak or non-functioning spark. Factors such as poor fuel quality or faulty spark plugs can also contribute to coil failure.

When to Replace Your Coils

If your car is showing signs like engine misfires, rough idling, or stalling, it might be time to check the coils. Ignition issues are often a clear indicator that coils need replacing. Genuine Mazda coils provide better longevity and performance compared to aftermarket alternatives. For models like the CX-5 or Mazda3, choosing a genuine replacement part is always the best option. A quality replacement part, such as an OEM spark plug, will also improve the overall performance of your vehicle.