Parts for your 2020 Subaru Outback-Ignition coils

2020 Subaru Outback Ignition Coils — What They Do and When to Replace

Ignition coils absolutely are used on the 2020 Subaru Outback. Both engines offered that year—the 2.5‑litre FB25 direct‑injection four and the 2.4‑litre FA24 turbo in XT models—use coil‑on‑plug (COP) ignition, with one coil mounted on each spark plug. This is documented in Subaru’s 2020 Outback workshop manual/engine section and parts catalogues, and is mirrored by technical listings from OEM suppliers such as Denso and NGK that specify individual COP units for these engines.

The job of an ignition coil is to take the car’s 12 volts and step it up to tens of thousands of volts so each spark plug can reliably ignite the air‑fuel mix. With COP, the coil sits right on the plug for cleaner spark and better control from the engine ECU. That means crisp starting, smooth idle, solid fuel economy, and lower emissions when everything’s healthy.

There’s no fixed service interval for ignition coils on the 2020 Outback, they’re generally “replace on condition.” What is scheduled is spark plug replacement—typically around 96,000 km (60,000 miles), though owners should follow the local Subaru maintenance schedule. Keeping fresh plugs reduces coil stress and helps prevent misfires. During routine servicing, a tech should visually check coils and boots for oil or coolant contamination, cracked housings, carbon tracking, or water ingress (common if the engine bay’s been pressure‑washed).

• Common symptoms of a failing coil: rough idle, sluggish take‑off, increased fuel use, and a flashing or steady check‑engine light. Typical fault codes include P030X (misfire) and P035X (ignition primary/secondary).
• Quick diagnosis trick: swap the suspect coil to another cylinder and see if the misfire follows. Always rule out the spark plug and connector first.
• Replacement tips: disconnect the negative battery terminal, lift the coil carefully to protect the boot, apply a smear of dielectric grease on reassembly, and tighten the coil hold‑down bolts to the service‑manual spec (around 6–8 N·m). Avoid washing coils with high‑pressure water.
• Parts choice: genuine Subaru or quality OEM‑equivalent coils (from known suppliers) keep the ECU happy and maintain drivability.

Left alone, a weak coil can damage the catalytic converter from unburnt fuel and turn a simple fix into a pricey one. If the Outback’s showing misfire symptoms, it’s worth getting it scanned and sorted promptly.

Does the 2020 Subaru Outback have ignition coils?

Yes. Both the 2.5 FB25 and 2.4 FA24 engines use four individual coil‑on‑plug units. This layout is confirmed by Subaru workshop manuals and parts catalogues, as well as OEM supplier fitment guides.

When should the ignition coils be replaced?

They’re not a routine replacement item. Replace them when there’s a confirmed fault or damage. Check them during scheduled spark plug changes (about 96,000 km) and any time a misfire code appears.

Is it safe to drive with a bad coil?

Not recommended. A persistent misfire can overheat the catalytic converter and cause further engine damage. If the check‑engine light is flashing or the car runs roughly, it’s best to have it inspected straight away.