Parts for your 2014 Subaru Outback-Ignition coils

2014 Subaru Outback ignition coils

Technical references including the Subaru Factory Service Manual for the 2014 Outback/Legacy platform, Subaru FAST parts catalogues, and major OE supplier catalogues (Denso and NGK/NTK) confirm that the 2014 Subaru Outback uses individual coil-on-plug ignition coils. Both engines offered that year—the 2.5‑litre FB25 four-cylinder and the 3.6‑litre EZ36 six-cylinder—are fitted with one ignition coil per cylinder.

On this Outback, the ignition coils are the little workhorses that transform the 12‑volt battery feed into the high voltage needed to jump the spark plug gap. By firing each plug directly (coil-on-plug), they deliver cleaner combustion, better fuel economy, and smoother running than older single “coil pack” or leaded systems.

They’re not a scheduled service item, but they do benefit from a bit of attention when the spark plugs are changed (typically around the 100,000 km mark, model and plug type dependent). During servicing, a good workshop will inspect the coil boots for cracks or carbon tracking, check for oil in the plug tubes, and ensure each coil seats firmly on the plug. A light smear of dielectric grease on the inside of the boot helps prevent arcing and makes future removal easier. If removing coils, avoid yanking by the connector, use the body of the coil and follow the service manual’s torque for the hold-down bolts.

Common warning signs of a tired coil include a rough idle, hesitation under load, higher fuel use, and a flashing or steady check engine light. Fault codes may show up as cylinder misfires (P0301–P0304 on the 2.5L, P0301–P0306 on the 3.6L) or coil circuit faults (P0351 and mates). Coils often fail one at a time, on higher‑kilometre vehicles it can be sensible to replace the matching boot, and if failures are clustered, consider replacing coils in pairs or as a set.

Replacement is straightforward but space can be tight near the chassis rails on the flat engines. Disconnect the battery, let the engine cool, unplug the connector tab gently, remove the hold-down bolt, and twist the coil slightly as it comes off the plug. After refitting, clear any codes and road‑test under load to confirm the fix. Quality OE-brand coils tend to last longer and play nicest with Subaru’s engine management, so they’re a wise pick for this Kiwi and Aussie favourite.

• Tip: If oil is found in plug tubes, address cam cover/tube seals first—oil will quickly kill new coils.
• Tip: Heat and vibration are the enemies, secure looms and covers to reduce stress on connectors.

How many ignition coils does a 2014 Subaru Outback have?

The 2.5‑litre FB25 has four individual coil-on-plug units—one per cylinder. The 3.6‑litre EZ36 has six coils, again one per cylinder. This layout improves spark accuracy and reliability compared with a single remote coil.

What are the common symptoms of a failing ignition coil?

Drivers often notice a shaky idle, sluggish acceleration, or a misfire under load. The check engine light may appear with codes like P030X (misfire) or P035X (coil circuit). Fuel economy can drop, and exhaust may smell a bit raw when a coil is on the way out.

Should coils be replaced individually or as a set?

It’s fine to replace a single failed coil if the rest test well. On higher‑kilometre Outbacks where multiple coils show age, replacing in pairs or as a full set can prevent repeat visits. Always inspect and, if needed, replace the boots, and fit quality OE‑equivalent parts.