Parts for your 2017 Subaru Xv-Ignition coils

2017 Subaru XV ignition coils

Yes, the 2017 Subaru XV is fitted with ignition coils. Factory technical sources confirm this: the Subaru Service Manual for the XV/GP series (FB20 engine, Ignition section) details a coil-on-plug setup with one coil per cylinder, and the Subaru genuine parts catalogue lists the individual ignition coil assemblies for the FB20. That means ignition coils are absolutely relevant when servicing a 2017 Subaru XV.

On this XV, each coil sits directly on its spark plug. Their job is to step up the battery’s 12 volts to the thousands of volts needed to jump the spark plug gap and ignite the air–fuel mix. With coil-on-plug, there’s less energy loss than old-school leads, better timing control, and cleaner combustion for efficiency and smooth running.

As part of regular servicing, coils don’t have a fixed replacement interval, they’re replaced when faulty. Practical checks are best done when the spark plugs are due (typically around 100,000 km on the FB20 with iridium plugs, per Subaru schedules for AU/NZ markets). At that visit, a tech will:

• Scan for stored misfire or coil circuit codes (P0301–P0304, P0351–P0354).
• Inspect coil boots for carbon tracking, cracking, or oil intrusion from rocker cover seals.
• Check electrical connectors for corrosion and firm fit.
• Refit with a light smear of dielectric grease on the inner boot to help sealing.

Common signs a coil is on the way out include a rough idle, hesitation under load, higher fuel use, and a flashing or steady check engine light. Because the XV uses one coil per cylinder, a single dud coil can cause a specific cylinder misfire. If a misfire is confirmed, swap-testing coils between cylinders is a quick diagnostic trick to see if the fault follows the coil.

When replacing plugs or coils, follow service manual torque specs: spark plugs around 25 N·m, and the coil hold-down bolt roughly 6–8 N·m. Over-tightening can crack housings or distort the seal, under-tightening risks poor contact and arcing. Use quality OE-spec coils (commonly Denso on Subaru) and avoid pulling coils out by the connector—use the body of the coil. Keep water and degreasers away from the wells after engine washing, as moisture in the plug tubes can trigger misfires.

Look after the coils and plugs together and the 2017 XV’s FB20 will stay happy on both the school run and those long Kiwi or Aussie road trips.

Popular questions about 2017 Subaru XV ignition coils

How long do ignition coils usually last on a 2017 XV?
With quality fuel and regular servicing, many coils last well past 150,000 km. There’s no set change interval—replace only when symptoms or diagnostics point to a fault. Checking coils whenever spark plugs are replaced is the smart move.

What are the symptoms of a failing ignition coil?
Expect rough idle, hesitation on hills, poorer fuel economy, and a check engine light with misfire codes. Sometimes there’s a sulphur smell from raw fuel in the exhaust. If ignored, a persistent misfire can damage the catalytic converter.

Is it OK to drive with a bad ignition coil?
Short, gentle trips might be possible, but it’s not recommended. Ongoing misfire can overheat the cat, foul plugs, and increase fuel use. It’s best to diagnose promptly and replace the suspect coil.