Parts for your 2023 Subaru Impreza-Ignition coils

2023 Subaru Impreza Ignition Coils

Yes, the 2023 Subaru Impreza absolutely uses ignition coils. Technical sources such as the Subaru Service Manual (Impreza 2017–2023, Engine/Ignition System) and Subaru’s genuine parts catalogue specify a coil-on-plug setup for the FB20 direct-injected 2.0‑litre petrol engine—four individual ignition coils, one per cylinder. Diagnostic procedures in the factory manual also reference coil-related DTCs (for example, P0351–P0354), confirming the presence and role of the coils.

The ignition coils on a 2023 Subaru Impreza take the 12‑volt battery supply and step it up to the high voltage needed to fire the spark plugs. With a modern coil-on-plug arrangement, each cylinder gets its own coil, improving spark accuracy, reducing energy loss through leads, and helping with smoother running and cleaner emissions. When they’re healthy, the car starts crisply, idles neatly, and pulls well through the rev range.

There’s no fixed replacement interval for ignition coils on this model—they’re a service-as-needed item. However, keeping the spark plugs fresh (typically around the 100,000 km mark, depending on local schedule and fuel quality) reduces coil stress and keeps the ignition system humming along. During routine servicing, it’s smart to inspect the coil connectors and wiring for heat damage or corrosion, and to make sure the boots are clean and seated properly on the plugs. A light smear of dielectric grease on the boot can help prevent moisture intrusion.

Signs a coil may be on the way out include a rough idle, hesitation under load, a drop in fuel economy, and the check engine light with misfire or coil circuit codes. If one coil fails, it’s fine to replace it individually, that said, on higher‑kilometre cars, some owners choose to replace the full set to avoid repeat visits. Always follow the Subaru workshop specs for bolt torque and connector handling—those plastic clips don’t love rough treatment.

• Common symptoms: hard starting, misfire at cruise or acceleration, strong fuel smell from unburnt fuel.
• Good practices: replace spark plugs on schedule, keep water and oil out of the plug wells, scan for codes before parts swapping.
• DIY level: moderate. Access is straightforward, but use care with harnesses and confirm torque with the service data.

Looked after properly, the Impreza’s coil-on-plug setup is a tidy, reliable bit of kit that delivers consistent spark and smooth everyday performance.

Popular questions about 2023 Subaru Impreza ignition coils

Do all 2023 Imprezas have one coil per cylinder?
Yes. The FB20 engine runs a coil-on-plug design with four individual coils. This layout sharpens ignition timing, trims electrical losses, and makes misfire diagnosis more precise.

When should the ignition coils be replaced?
Only when they show faults—there’s no routine replacement interval. If you’re chasing misfires, scan for DTCs, inspect the plugs and connectors, and replace any weak coil. Many owners consider a full set swap at higher kilometres if multiple coils age together.

Can a handy owner replace an ignition coil at home?
Usually, yes. Basic tools and care with the wiring are key. Disconnect the battery, remove the hold‑down bolt, swap the coil, and refit to spec. If in doubt, follow the Subaru service manual or ask a trusted workshop.