Parts for your 2020 Subaru Impreza-Spark plugs

2020 Subaru Impreza Spark Plugs — Purpose, Care, and When to Replace

Yes, spark plugs are fitted to the 2020 Subaru Impreza. This model runs a 2.0‑litre FB20 direct‑injection petrol boxer four, which relies on coil‑on‑plug ignition and long‑life iridium plugs. Technical sources that confirm this include Subaru’s Owner’s Manual, the Service & Warranty Maintenance Booklet, and major ignition component catalogues used by workshops. So if someone’s chasing “2020-subaru-impreza/spark-plugs”, they’re definitely looking at a relevant service item.

Spark plugs do the simple but critical job of lighting off the air‑fuel mix in each cylinder. In the Impreza’s FB20, that clean, consistent spark keeps starts quick, the idle smooth, and fuel use sensible around town. As plugs wear, the spark weakens and the engine management has to work harder to compensate, which can lead to rough running, a drop in power, and higher consumption.

For most Aussie and Kiwi owners, replacement is typically due around 100,000 km (often aligned with Subaru’s scheduled servicing for this engine family). Some service schedules and climates may differ, and direct‑injection engines can be tougher on plugs, so it’s smart to follow the intervals in the Service & Warranty booklet for the vehicle’s market. If the car sees lots of short trips, dusty roads, or spirited driving, a mechanic may suggest earlier replacement.

• Common signs it’s time: sluggish acceleration, rough idle, harder starts, poorer fuel economy, or a check‑engine light for misfire.
• Best practice: replace all four plugs together with OEM‑spec iridium types, fit them to the correct gap as supplied, and torque to the factory spec.

During a plug change on the Impreza, a good workshop will also inspect coil boots, look for oil in the plug tubes, and check the engine air filter and PCV system—small things that help the new plugs last. Iridium plugs don’t usually need regapping, and anti‑seize isn’t recommended unless the plug maker specifies it. Keeping the engine on fresh fuel and servicing it on time helps maintain a strong spark and smooth performance between changes.

Bottom line: quality iridium plugs, fitted correctly and replaced at the right interval, keep the 2020 Impreza feeling perky and efficient across many kilometres.

Popular questions

How often should spark plugs be replaced on a 2020 Subaru Impreza?
Most owners will see replacement fall around the 100,000 km mark under normal driving. Because service schedules vary by market and conditions, always follow the interval in the Subaru Service & Warranty Maintenance Booklet for the specific vehicle.

If the Impreza does lots of short trips, towing, or dusty rural work, a technician may recommend earlier inspection or replacement.

What type of spark plug does the 2020 Impreza use?
The FB20 engine is designed for long‑life iridium plugs and uses a coil‑on‑plug setup. Stick with OEM‑equivalent iridium plugs from recognised brands to match heat range and reach, and avoid mix‑and‑match types.

Iridium plugs come pre‑gapped to spec, don’t force the ground strap as it can damage the fine wire centre electrode.

What are the signs the Impreza’s spark plugs need attention?
Look for rough idle, hesitant take‑off, increased fuel use, or a misfire warning. Cold starts that feel lazier than usual can also hint at worn plugs.

Any of these symptoms warrant a check by a qualified technician, who can scan for fault codes and inspect plugs and coils together.