Parts for your 2017 Subaru Outback-Ignition coils

2017 Subaru Outback ignition coils

Technical sources confirm that ignition coils are fitted to the 2017 Subaru Outback. The Subaru Factory Service Manual (MY17 Outback, Engine/ Ignition System) and Subaru’s genuine parts catalogue list individual coil‑on‑plug units for both the 2.5‑litre FB25 and 3.6‑litre EZ36 petrol engines. Major ignition component catalogues from OEM suppliers also specify direct‑fit coils for this model, so ignition coils are absolutely relevant to servicing this Outback.

On this model, each cylinder gets its own coil mounted directly over the spark plug. The coil takes the 12‑volt battery supply and steps it up to the thousands of volts needed to jump the plug gap. Controlled by the engine computer, these coils ensure efficient combustion, crisp starting, solid performance, and tidy fuel economy.

Ignition coils aren’t a scheduled replacement item, but they do deserve attention during routine servicing—especially when changing spark plugs as per the logbook interval for the local market. Under the bonnet, a tech will check each coil for cracking, heat stress, and oil or moisture in the plug tubes, then clean the wells and apply a light smear of dielectric grease to the boots before refitting. Coils should be seated squarely and tightened to the service‑manual torque, with wiring clips refitted so nothing chafes.

• Common symptoms of a failing coil: rough idle, hesitations under load, hard starting, higher fuel use, and a Check Engine Light (often with a P030X cylinder‑specific misfire code).
• Quick diagnosis: scan for codes, then swap the suspect coil to another cylinder—if the misfire follows, the coil is the culprit.

If a coil has failed, replacing the single faulty unit with an OEM‑quality part is fine. On higher‑kilometre cars where multiple coils show intermittent misfires, it can be sensible to replace the set to avoid repeat visits. Always pair new coils with healthy spark plugs—old, widened plug gaps make coils work overtime and shorten their life.

Practical tips: disconnect the negative battery terminal before unplugging coils, let the engine cool, keep the plug wells clean, and never yank coils out by the wiring. Look after the ignition coils and the Outback will reward with smoother running, better efficiency, and lower emissions.

Popular questions

How many ignition coils does a 2017 Subaru Outback have?
The 2.5‑litre FB25 has four coils (one per cylinder). The 3.6R EZ36 has six coils. Both engines use coil‑on‑plug designs for precise control and reliability.

When should ignition coils be replaced on this model?
Only when they’re faulty or contaminated. Have them inspected at services and whenever spark plugs are replaced. Misfire codes, rough running, or cracks on the housing are prompts to test and replace.

Is it safe to keep driving with a bad coil?
It’s not a great idea. Prolonged misfires can overheat and damage the catalytic converter and can wash raw fuel into the exhaust. It’s best to diagnose and fix the issue promptly.