Parts for your 2018 Subaru Legacy-Ignition coils

Ignition Coils on the 2018 Subaru Legacy: What You Need to Know

The 2018 Subaru Legacy is a well-regarded midsize sedan that blends performance, reliability, and advanced engineering. When it comes to the ignition system, this vehicle does indeed use ignition coils as a vital component. Ignition coils play an essential role in ensuring the engine runs smoothly, fires correctly, and maintains fuel efficiency. If you're looking to understand what ignition coils do, their importance for the 2018 Subaru Legacy, and how to care for or replace them, this guide has you covered.

So, what exactly are ignition coils? Essentially, they're the part of the vehicle's ignition system that transforms the 12-volt power from the battery into the much higher voltage needed to create a spark in the spark plugs. This spark ignites the air-fuel mixture inside the engine cylinders, allowing the engine to operate. Without properly functioning ignition coils, the vehicle may experience misfires, rough running, or trouble starting.

The 2018 Subaru Legacy commonly features a coil-on-plug ignition system, which means each cylinder has its own individual ignition coil positioned directly above the spark plug. This design helps improve ignition efficiency and reduces potential problems associated with traditional distributor systems. It also means that if one coil fails, it will typically affect only the cylinder it serves, making diagnosis easier.

Keeping the ignition coils in good nick is important for maintaining the overall health of the engine. Over time, ignition coils can wear out or develop faults due to heat, vibration, and general ageing. Some signs that an ignition coil might be loopy include engine misfires, rough idling, decreased fuel economy, or even the check engine light appearing on your dashboard.

When servicing your 2018 Subaru Legacy, mechanics will often check ignition coil condition along with spark plugs and other ignition components. Routine maintenance can avoid the annoying symptoms of coil failure and keep the engine firing perfectly. It is recommended to have a qualified technician inspect the ignition coils every 100,000 kilometres or sooner if you notice any performance issues.

Replacing an ignition coil in the 2018 Subaru Legacy is generally straightforward thanks to the coil-on-plug design. No complicated wiring or distributors mean a quick swap is usually possible, cutting down on labour costs. A failed coil should always be replaced rather than repaired, as internal damage to the coil's windings or insulation is not serviceable.

Also, when replacing ignition coils, it's a good idea to inspect and possibly replace the spark plugs at the same time. Worn spark plugs can put extra strain on ignition coils, causing them to work harder and potentially fail sooner. Keeping both components in good shape extends engine life and optimises fuel usage.

Another handy tip for owners of the 2018 Subaru Legacy is to avoid using cheap or substandard ignition parts. Genuine or high-quality aftermarket coils provide better reliability, longevity, and peace of mind. Skimping on parts may save a few bucks upfront but usually leads to headaches down the track.

In case of coil failure, modern engine management systems will often register trouble codes that make diagnosis easier if you use an OBD-II scanner. This can help pinpoint the exact cylinder with the faulty coil and speed up repairs. If you're unsure about performing these checks yourself, a professional Subaru mechanic will be able to quickly diagnose and rectify any ignition-related issues.

Finally, the ignition coil is just one part of the complex ignition and fuel delivery system in the Subaru Legacy, but it certainly plays a starring role. Making sure it performs well helps maintain engine power, smooth acceleration, reliable starts, and lower emissions. For anyone wanting their 2018 Legacy to run reliably and efficiently for years to come, paying attention to ignition coil health is essential during routine servicing.