Parts for your 2019 Subaru Impreza-Spark plugs

2019 Subaru Impreza Spark Plugs

Yes, the 2019 Subaru Impreza uses spark plugs. The Aussie/NZ‑spec 2.0‑litre FB20 petrol boxer is a spark‑ignition engine, and Subaru specifies long‑life iridium plugs from factory. This is confirmed by Subaru’s MY2019 Impreza service schedule and FB20D engine manual, as well as NGK and Denso application catalogues for that model. So spark plugs are very much relevant to routine servicing, unlike diesel or electric drivetrains that don’t use them.

What do they actually do? A spark plug delivers a precise high‑voltage spark that lights the compressed air‑fuel mix, kick‑starting combustion thousands of times per minute. On the direct‑injected FB20, the right plug heat range and clean, sharp iridium centre electrode help maintain cold‑start manners, smooth idle, and good fuel economy. Healthy plugs also keep the catalytic converter happier by ensuring more complete burn and fewer misfires, which helps emissions compliance and extends component life.

Subaru pitches these as long‑life items, but they still wear. In typical Australian and New Zealand service schedules, expect inspection around 60,000 km and replacement about every 96,000–100,000 km or 6 years, sooner if there’s hard city use or lots of short trips. Telltale signs it’s time include rough idle, sluggish take‑off, higher fuel use, hesitation under load, or the engine light flashing for misfire codes. Because the Impreza’s boxer layout tucks the plugs low and sideways under the guards, access is tighter than many in‑line engines, so correct tools and torque are important.

When replacing, stick with quality iridium plugs to the exact spec Subaru lists on the under‑bonnet label or in the owner’s manual. They arrive pre‑gapped, don’t force‑adjust fine‑wire electrodes. Always replace as a full set, use new coil‑boot dielectric where specified, and torque to spec on a cold engine to protect the alloy heads. If the car sees dusty roads or heavy use, add a mid‑interval inspection. A trusted workshop can bundle plugs with a scheduled service so the Impreza stays perky, efficient, and easy on fuel.

That modest spend brings crisper response, cleaner emissions, steadier idle, and fewer cold‑morning dramas — real peace of mind each time the key turns smoothly.

Popular questions about 2019 Subaru Impreza spark plugs

How often should the spark plugs be replaced on a 2019 Subaru Impreza?

For most owners, plan on about every 96,000–100,000 kilometres or roughly 6 years, with an inspection around 60,000 km. Severe stop‑start use or short trips can justify earlier checks. Always follow the Subaru maintenance schedule for your market.

What spark plug type and gap does the 2019 Impreza use?

Subaru specifies long‑life iridium plugs matched to the FB20’s heat range. They’re supplied pre‑gapped (typically around 1.1 mm) and should not be force‑adjusted. Check the under‑bonnet emissions/engine label or owner’s manual for the exact specification.

Is spark plug replacement a DIY job on the 2019 Impreza?

It’s possible for a confident home mechanic, but the boxer layout means tighter access and precise torque matters with the alloy heads. If tools, torque specs, and coil removal aren’t familiar, it’s smarter to book a workshop service.