Parts for your 2014 Subaru Exiga-Ignition coils

2014 Subaru Exiga ignition coils — what they do and how to look after them

Yes, the 2014 Subaru Exiga uses ignition coils. Subaru’s factory workshop manual for the YA-chassis Exiga specifies a coil-on-plug (COP) ignition system, and both the Subaru electronic parts catalogue and major OE suppliers like Denso/NGK list individual ignition coils for this model and its EJ/FB-series petrol engines. So ignition coils are very much relevant to any 2014 Subaru Exiga servicing or repair.

On the 2014 Exiga, each spark plug gets its own coil sitting right on top of the plug. The job is simple but critical: the coil transforms the 12-volt battery feed into the high voltage needed to jump the plug gap and light the air–fuel mix. Being coil-on-plug keeps spark strong, timing precise and electrical losses low — which helps economy, emissions and smooth running.

Because it’s a flat-four, the coils live low on each side of the engine under the bonnet, one per cylinder. Access can be tight, it’s normal to shift the air box or battery for better room on some cylinders. When a coil starts to go, drivers will often notice a rough idle, sluggish take-off, a flutter under load, higher fuel use and a check-engine light. Common OBD-II clues include misfire codes (P0301–P0304) and coil circuit faults (P0351–P0354).

They’re not a scheduled replacement item, but they do wear with heat and vibration. A sensible approach on an Exiga is:

• Inspect boots and connectors whenever spark plugs are changed (typically around the 100,000 km mark for iridium plugs).
• If one coil fails on a higher‑kilometre vehicle, consider replacing the pair on that bank or the full set if budget allows, to reduce repeat visits.
• Keep water and oil out of the plug tubes, rocker cover leaks can soak a coil and cause misfires.
• Use quality OEM-equivalent coils (Denso, Hitachi, NGK) and ensure connectors click home cleanly. A dab of dielectric grease on the boot helps future removal.

DIYers should disconnect the negative battery terminal, take photos of harness routing, and work with a small ratchet or spanner to avoid cracking the coil housing. If chasing a misfire, swap a suspect coil to another cylinder to see if the fault code follows — a neat way to confirm the culprit before buying parts.

Popular questions about 2014 Subaru Exiga ignition coils

How many ignition coils does a 2014 Subaru Exiga have, and where are they?
The 2014 Exiga has four individual coil-on-plug units — one per cylinder on its flat-four engine. They’re mounted directly on the spark plugs, low on each side of the engine. Access usually means removing the air box or battery on one side to get decent hand room.

What are the common symptoms and fault codes of a failing coil?
Expect rough idle, hesitation, poor fuel economy, and a flashing or steady check-engine light. Typical OBD-II codes are P0301–P0304 for cylinder misfires and P0351–P0354 for coil circuit issues. Moisture or oil in the plug tubes can make symptoms worse, so it’s worth checking for leaks.

Should all coils be replaced at once?
It’s fine to replace just the faulty coil on a lower‑kilometre car. On higher‑kilometre Exigas, many owners choose to do the full set to avoid another visit if a sibling coil fails soon after. Either way, it’s smart to renew spark plugs at the same time if they’re due.