Parts for your 2019 Subaru Impreza-Ignition coils

Ignition Coils on the 2019 Subaru Impreza: What They Do and When to Replace Them

The 2019 Subaru Impreza, like most modern petrol vehicles, does come equipped with ignition coils. Ignition coils play a crucial role in the vehicle's ignition system, making them an essential component that ensures the engine runs smoothly and efficiently. Understanding what ignition coils do and how to maintain them can help keep your Subaru Impreza performing at its best.

Ignition coils are responsible for transforming the 12-volt power from the vehicle's battery into thousands of volts needed to create a spark at the spark plugs. This spark ignites the air-fuel mixture in the engine's combustion chambers, which drives the pistons and powers the car. In simple terms, without functioning ignition coils, your Impreza wouldn't start or run properly.

The 2019 Subaru Impreza utilises a coil-on-plug system, meaning each cylinder has its own ignition coil mounted directly on top of the spark plug. This design offers several advantages over older distributor-based systems or single-coil setups. The coil-on-plug system provides a more reliable spark, better fuel efficiency, and reduced emissions. It also means if one cylinder has a faulty ignition coil, it doesn't usually affect the others, limiting engine misfire issues to just that one cylinder.

When it comes to servicing your 2019 Impreza's ignition coils, routine maintenance is important even though these components are generally reliable. The lifespan of ignition coils can vary widely based on driving habits, environment, and overall vehicle care, but they typically last well over 100,000 kilometres. However, they can still wear out or get damaged, leading to engine misfires, rough idling, decreased fuel economy, and sometimes difficulty starting the car.

There are a few telltale signs that your Impreza's ignition coils might need attention:

• The engine light comes on. This will often be accompanied by diagnostic trouble codes related to misfires.
• The car runs rough or stumbles, especially during acceleration or at idle.
• Noticeable drop in fuel efficiency.
• Hard starting or stalling.

If any of these symptoms appear, it's a good idea to have the ignition coils checked by a qualified mechanic. Modern diagnostic tools can quickly pinpoint which coil is underperforming or failing.

Replacing ignition coils on a Subaru Impreza is generally straightforward. Since the coil-on-plug design means the coils are mounted right on top of the spark plugs, the mechanic will typically remove each faulty coil, swap it out with a new one, and reinstall everything. It's best practice to replace coils in pairs or sets where recommended to maintain balanced engine performance and avoid uneven wear.

Despite being durable, ignition coils are exposed to engine heat, vibration, and other harsh conditions which can gradually damage their internal insulation and wiring. Moisture and oil leaks can also cause corrosion or shorts in the coils. That is why, apart from replacing faulty coils, routine inspections during vehicle servicing can help catch early signs of coil issues before they become major problems.

In addition to coil replacement, keeping spark plugs in good condition and regularly servicing your Impreza's ignition system will extend the life of ignition coils. Worn or fouled spark plugs force coils to work harder, which can shorten their lifespan. Subaru's recommended service intervals usually cover spark plug replacement and ignition system checks, so sticking to these schedules is a smart move.

In summary, if you own a 2019 Subaru Impreza, ignition coils definitely form a part of its ignition system and are essential for proper engine operation. They convert battery voltage into the spark needed for combustion and are designed to be reliable but not invincible. Recognising symptoms of coil trouble early, having regular servicing, and replacing any faulty ignition coils promptly can ensure your Subaru runs smoothly and efficiently for many years.