Parts for your 2012 Subaru Exiga-Ignition coils

2012 Subaru Exiga ignition coils — what they do and when to replace

Technical sources confirm the 2012 Subaru Exiga is fitted with ignition coils. The Subaru Factory Service Manual for the Exiga (YA series, Ignition System section) specifies a coil-on-plug setup, with one coil per cylinder. Subaru’s official parts catalogue (FAST/EPC for YA9/YAM) and aftermarket catalogues from Denso and NGK/NTK also list direct-fit ignition coils for 2012 Exiga variants (including EJ-series petrol engines), which verifies that ignition coils are relevant and used on this model.

On the 2012 Subaru Exiga, the ignition coils are the hardworking spark-makers that sit right on top of each spark plug. Each coil takes the 12-volt feed and steps it up to thousands of volts to fire the plug, lighting the fuel-air mix in the boxer four. With a coil-on-plug system, the Exiga keeps spark energy strong and consistent, helping cold starts, smooth idle and decent fuel economy.

They’re not usually a scheduled replacement item in the logbook, but they do age. Heat soak around the cylinder heads and under-bonnet moisture can crack housings or break down insulation. Common telltales include a rough idle, flat spots on acceleration, increased fuel use, and a flashing MIL with misfire codes (often P0301–P0304). If that pops up, a quick scan and a simple coil swap test between cylinders usually nails which unit is crook.

When servicing a 2012 Exiga, it pays to check coil connectors and loom condition, especially if the vehicle has seen a lot of coastal driving or engine-bay washing. Replace spark plugs on time (typically around 100,000 km for iridium) to keep coil load down. If one coil has clearly failed at high kilometres, many techs recommend replacing the set to avoid repeat visits, provided the budget allows. Stick with quality coils from reputable brands or genuine Subaru, poor copies can cause repeat misfires or radio interference.

During fitment, keep the coil boots clean, use a light smear of dielectric grease inside the boot, and torque the plugs correctly before refitting coils. Avoid yanking on the wiring, and don’t blast coils with a pressure washer. With a healthy set of coils, the Exiga’s flat-four runs sweet, pulls cleanly up hills, and won’t leave the family stranded.

• Typical lifespan: often 150,000–250,000 km, but heat and age vary the outcome.
• Best practice: diagnose with a scan tool, confirm with swap testing, and replace in sets if multiple show the same ageing signs.

Popular questions about 2012 Subaru Exiga ignition coils

How many ignition coils does a 2012 Subaru Exiga have?
The 2012 Exiga runs a coil-on-plug system with one ignition coil per cylinder. On the petrol flat-four, that means four coils in total, each mounted directly on its spark plug to deliver a strong, accurate spark.

How long do the coils last, and should they be replaced pre-emptively?
Many last well past 150,000 km, with some going beyond 200,000 km. They’re not a routine service replacement, most workshops replace only when symptoms or fault codes appear. If one fails at high kilometres, replacing the full set can be smart to prevent staggered failures.

What are the signs of a failing ignition coil on a 2012 Exiga?
Look for rough idle, hesitation under load, higher fuel use, and a check-engine light with misfire codes (P0301–P0304). You might also notice a raw fuel smell from the exhaust during a misfire. A scan and targeted testing will confirm the culprit.