Parts for your 2022 Subaru Outback-Spark plugs

2022 Subaru Outback spark plugs — what they do and when to change them

Yes, the 2022 Subaru Outback absolutely uses spark plugs. The model’s petrol boxer engines — the 2.5‑litre FB25 and, where fitted, the 2.4‑litre turbo FA24 — are spark‑ignition designs. This is confirmed in the 2022 Outback Owner’s Manual, Subaru’s service/maintenance schedules used in AU/NZ dealer networks, and parts catalogues from OEM plug makers such as NGK and Denso. Those sources list long‑life iridium spark plugs for both engines.

What do they do? Spark plugs ignite the air–fuel mix in each cylinder at precisely the right moment. Good plugs mean quicker starts on cold mornings, a smoother idle, better fuel economy, and crisper throttle response. On modern direct‑injected Subarus, the plug’s fine iridium tip and correct heat range help manage combustion under lean and high‑load conditions, which keeps emissions tidy and the engine feeling lively.

Recommended replacement timing depends on the exact engine and market schedule. As a rule of thumb from Subaru maintenance literature: the naturally aspirated 2.5 FB25 typically sees plugs replaced around 100,000 km, while the 2.4 turbo FA24 is often shorter, about 60,000 km. Always follow the interval printed in the Owner’s Manual or the under‑bonnet service label for the vehicle’s VIN and market.

• Tell‑tale signs they’re due: rough idle, sluggish take‑off, poorer fuel use, hard starting, or misfire codes (e.g., P0301–P0304).
• Best practice: replace all four plugs as a set with the correct iridium spec, not a “close enough” alternative.

When fitting, use the specified torque and avoid anti‑seize unless the plug maker expressly permits it — most iridium plugs come pre‑plated. Check and only lightly adjust the gap if the manufacturer allows, many fine‑wire iridium plugs are pre‑gapped and shouldn’t be forced. Inspect coil boots for carbon tracking, apply dielectric grease if specified, and clear any fault codes after the job.

Because the boxer engine tucks the plugs out to the sides, access can be snug. A shop will typically allow around 1.5–2.0 hours to do the set, including removing ancillary bits and a road test. Sticking to the proper interval helps protect the coils, keeps fuel economy on point, and prevents stubborn, over‑worn plugs from seizing in the heads.

If the Outback is serviced mainly on short trips, tows regularly, or runs on lower‑octane petrol, checking plug condition a little earlier is a smart move.

Popular questions about 2022 Subaru Outback spark plugs

What spark plugs does a 2022 Subaru Outback use?
The 2022 Outback’s petrol engines use long‑life iridium spark plugs matched to the FB25 or FA24’s heat range and reach. The exact part number varies by engine code and market, so it’s best to use OEM‑equivalent NGK or Denso listings for the VIN. Always fit four matching plugs and stick with iridium for longevity and stable ignition.

How often should the plugs be changed?
For most AU/NZ schedules, the 2.5‑litre FB25 is around 100,000 km, while the 2.4‑litre turbo FA24 is commonly about 60,000 km. Check the Owner’s Manual or dealer servicing guide for the official interval on that exact vehicle, as usage and market can shift the timing.

What are the symptoms of worn spark plugs on an Outback?
Expect a lumpy idle, hesitation under load, reduced fuel economy, harder cold starts, and sometimes a flashing MIL with misfire codes. If those pop up, a plug and coil inspection is a good first step before chasing fuel or sensor issues.