Parts for your 2015 Subaru Forester-Ignition leads

2015 Subaru Forester ignition leads: not fitted, and here’s why

For the 2015 Subaru Forester (SJ series), ignition leads aren’t used. Instead, all petrol variants of this model run a direct ignition, coil‑on‑plug (COP) setup. Each spark plug has its own ignition coil mounted directly on top, so there are no traditional high‑tension leads routing spark from a remote coil pack. This applies to the FB‑series naturally aspirated engines and the FA20DIT turbo engine fitted to the XT.

Subaru’s workshop documentation for the SJ Forester describes the ignition system as “direct ignition / coil‑on‑plug,” and the official parts catalogue lists individual ignition coils and spark plugs, but no HT lead set. The owner’s manual maintenance schedule specifies spark plug replacement intervals yet contains no ignition wire service item. Reputable aftermarket catalogues (e.g., NGK, Bosch) also offer coils and plugs for this model, with no listing for ignition leads. Together, those technical references confirm that ignition leads simply aren’t part of the 2015 Forester’s design.

Why the change? Coil‑on‑plug delivers a stronger, more precisely timed spark, reduces energy losses through long leads, improves cold starts and emissions, and cuts down on serviceable components. With the coils sealed at the plug under the bonnet, moisture‑related arcing—common on old lead sets—is far less likely.

What does this mean for servicing? Attention shifts to the items that actually exist on the car: spark plugs, ignition coils, and their boots/connectors. Owners should follow the logbook interval for plugs (iridium types typically go long kilometres, check the exact schedule for the engine code), inspect coil boots for carbon tracking, ensure the coil connectors are sound, and look for oil in the plug tubes from rocker cover gasket seepage. If there’s a misfire under load, rough idle, or a P0300–P0304 fault, diagnosis focuses on coils, plugs, and intake or fuel issues—not non‑existent leads.

Technical sources referenced:

• Subaru Forester SJ Series Workshop Manual (2014–2018), Engine: Ignition System – Direct ignition, coil‑on‑plug
• 2015 Subaru Forester Owner’s Manual – Maintenance and service: spark plug specifications and intervals, no ignition wire item
• Subaru genuine parts catalogue for MY2015 Forester – individual ignition coil listings, no HT lead set
• Aftermarket ignition catalogues (e.g., NGK, Bosch) for 2015 Forester – coils and plugs listed, no ignition leads

Popular questions about 2015 Subaru Forester ignition leads

Does a 2015 Subaru Forester have ignition leads?
No. The 2015 Forester uses a coil‑on‑plug ignition system with an individual coil on each spark plug, so there are no traditional high‑tension leads to replace.

What should be serviced instead of ignition leads on a 2015 Forester?
Focus on spark plugs, ignition coils, and the coil boots/connectors. Replace plugs per the vehicle’s service schedule, check for carbon tracking on boots, ensure connectors are snug, and confirm there’s no oil in the plug tubes from rocker cover gasket seepage.

Symptoms that feel like “bad leads” on older cars—what applies here?
If there’s a misfire, hesitation under load, or rough idle, common culprits are worn spark plugs, a failing individual coil, intake leaks, or fuel issues. Scan for P0300–P0304 codes and inspect coils and plugs before chasing anything else.