Parts for your 2016 Subaru Xv-Spark plugs

2016 Subaru XV spark plugs — what they do and when to replace

Yes, spark plugs are fitted to the 2016 Subaru XV sold in Australia and New Zealand. Technical references including the Subaru Owner’s Manual and Service & Warranty Handbook for MY16 XV (FB20 2.0‑litre petrol), Subaru workshop literature, plus NGK and Denso application catalogues all list four iridium spark plugs for the FB20 boxer engine. Only diesel variants (sold in some overseas markets) use glow plugs instead, not spark plugs.

The spark plugs in a 2016 XV do the hard yakka of igniting the fuel–air mix in each cylinder. With the XV’s horizontally opposed four‑cylinder (boxer) layout and coil‑on‑plug ignition, healthy plugs help it start cleanly on cold mornings, pull smoothly up hills, sip less fuel, and keep emissions in check. Because Subaru specifies long‑life iridium plugs for the FB20, they’re built to last — but they still wear over time.

As part of regular servicing, owners should plan for plug replacement roughly around the long‑life interval specified in the Subaru Service & Warranty Handbook (commonly about 100,000 km for FB‑series petrol engines), and bring the job forward if there are symptoms like:

• Hard starting, rough idle, or hesitation under load
• Higher fuel use and a drop in power
• Misfire codes or a flashing check‑engine light

It’s smart to have the plugs inspected during routine services (e.g., every 30,000–50,000 km). A technician will look for worn electrodes, heavy deposits, cracked insulators, or oil fouling — all signs it’s time to renew. When replacing, stick with genuine or equivalent iridium plugs specified for the FB20. Fine‑wire iridium plugs are usually pre‑gapped, avoid forcing the gap. Always torque to the Subaru workshop spec and refit coil boots carefully to keep moisture out.

Access on the boxer can be tight, so many owners leave this to a pro. If a keen DIYer is tackling the job, let the engine cool, work one cylinder at a time, use a quality plug socket, and don’t use anti‑seize on plated iridium plugs (as per major plug manufacturers’ guidance). Done right, fresh plugs will keep the XV running sweet, deliver better throttle response, and help protect the catalytic converters by preventing misfires.

Technical references: Subaru MY16 XV Owner’s Manual, Subaru Australia/NZ Service & Warranty Handbook for FB20, Subaru workshop literature for FB‑series engines, NGK and Denso application catalogues for 2016 Subaru XV (FB20).

Popular questions

What spark plug type and gap does a 2016 Subaru XV use?
The 2016 XV with the FB20 petrol engine uses long‑life iridium spark plugs specified by Subaru (genuine or equivalent from major brands like NGK or Denso). The correct part number and specification are listed in the Owner’s Manual or Service & Warranty Handbook. These fine‑wire iridium plugs are typically supplied pre‑gapped, avoid re‑gapping unless the manufacturer explicitly allows it.

How often should the spark plugs be replaced?
For the FB20 petrol engine, Subaru’s schedule generally places spark plugs at a long‑life replacement interval of about 100,000 km. Actual intervals can vary by market and operating conditions, so follow the Service & Warranty Handbook for the vehicle. If there are misfires, rough running, or increased fuel consumption, have them checked sooner.

Can a competent DIYer change the plugs at home?
It’s doable for a confident DIYer with the right tools, but space is tight on the boxer. Plan extra time, let the engine cool, remove any intake or battery hardware that blocks access, and torque the new plugs to spec. Many owners prefer a qualified technician to ensure correct fitment and to inspect coil boots and seals at the same time.