Parts for your 2016 Subaru Impreza-Spark plugs

2016 Subaru Impreza spark plugs — what they do and when to swap them

Technical sources including the 2016 Subaru Impreza Owner’s Manual, the Subaru Warranty and Maintenance booklet, and the Subaru FB-series engine service information confirm this model runs a petrol FB20 boxer engine with coil-on-plug ignition. That means spark plugs are absolutely fitted and relevant on the 2016 Subaru Impreza.

In this Impreza, spark plugs create the spark that ignites the air–fuel mix, keeping cold starts clean, throttle response crisp, fuel economy on point, and emissions in check. From factory, they’re fine-wire iridium plugs designed for long life and stable spark, even under Aussie and Kiwi stop–start commuting or open-road touring.

For servicing, Subaru’s maintenance schedule for the 2016 Impreza specifies plug replacement at roughly 96,000 km (about 60,000 miles), depending on market and conditions. Owners should confirm the exact interval in their vehicle’s maintenance booklet. High-heat, dusty, or short-trip use can justify earlier replacement. Always replace the full set of four at once.

Best practice under the bonnet:

• Use OEM-spec iridium plugs matched to the FB20 heat range.
• Install on a cold engine and torque to the service manual spec, don’t overtighten.
• Avoid anti-seize on modern plated plug threads, it can alter torque and lead to over-tightening.
• Plug gaps are typically pre-set for iridium designs, don’t force-gap them.
• Inspect coil boots for cracking or carbon tracking, use a light smear of dielectric grease on the inside lip if recommended.
• Check the plug tubes for oil, any oil suggests a rocker cover gasket issue that’s worth fixing while you’re there.

Because the Impreza’s boxer layout tucks the plugs low on each side, access is tighter than many in-line engines. It’s doable at home with patience, the right wobble extensions, and careful routing of the coils, but plenty of owners prefer a trusted mechanic to avoid cross-threading or damaging coil connectors.

Signs the plugs are due include hard starting, rough idle, sluggish take-off, pinging under load, rising fuel use, or a check engine light with misfire codes. Fresh, correctly fitted plugs help the 2016 Impreza run smoother, sip less petrol, and keep emissions gear happier for longer.

Popular questions about 2016 Subaru Impreza spark plugs

How often should spark plugs be changed on a 2016 Impreza?
Subaru’s schedule for this model typically calls for replacement at around 96,000 km, but owners should confirm in their maintenance booklet. If the car sees short trips, frequent idling, or heavy loads, earlier replacement can be smart.

What type of spark plug does the 2016 Impreza use?
It’s designed for fine-wire iridium plugs matched to the FB20 engine’s heat range. Choosing OEM-spec plugs maintains correct heat dissipation, reliable ignition, and the intended service life.

Can it be a DIY job?
Yes, with the right tools and care. The boxer layout means tighter access, so expect to work from the sides and take your time. If in doubt about torque, coil handling, or plug tube sealing, a qualified mechanic is the safer bet.