Parts for your 2016 Subaru Impreza-Ignition leads

2016 Subaru Impreza ignition leads — are they used?

For the 2016 Subaru Impreza (GP/GJ, FB20 engine), conventional ignition leads aren’t fitted. Technical references confirm this model runs a direct coil-on-plug ignition system: the Subaru Service Manual for 2016MY Impreza (Engine — Ignition System) specifies a Direct Ignition System with an individual ignition coil mounted directly over each spark plug. The Subaru electronic parts catalogue for the same model lists four ignition coil assemblies and spark plugs, with no high-tension (HT) lead set. Industry guidance from ignition specialists such as NGK on coil-on-plug systems also notes that vehicles using COP do not use traditional spark plug leads.

Why no ignition leads? With a coil-on-plug layout, high voltage is generated at each cylinder, so there’s no need to route that energy through long HT leads. That shortens the path to the spark, reducing energy loss and electrical interference, improving spark accuracy and reliability, and helping the ECU detect misfires more precisely. It also tidies packaging in a tight engine bay and supports better emissions control.

What should be serviced instead? On this Impreza, maintenance focuses on the spark plugs and the individual coils. Subaru specifies long-life iridium plugs for the FB20, typically replaced around the 100,000 km mark (or per the local service schedule). During servicing, a technician should inspect the coil boots and connectors for cracking, carbon tracking, oil ingress, or moisture, and ensure the connectors lock positively. If a misfire is suspected, scan for cylinder-specific codes (for example, P0301–P0304) and check both the plug condition and the coil on the affected cylinder. Use the correct iridium plugs in the specified heat range, avoid altering the factory-set gap, and refit coils carefully to prevent damaging the boots. Keeping water away from the coils and harness plugs when cleaning the engine bay also helps avoid nuisance misfires.

• Typical symptoms of ignition issues on this model include rough idle, hesitation under load, harder starting, reduced fuel economy, and an illuminated check engine light.
• Because there are no ignition leads to replace, owners can budget for periodic spark plug renewal and only replace individual coils if they’re proven faulty.

Does the 2016 Subaru Impreza have ignition leads?

No. The 2016 Impreza with the FB20 engine uses a coil-on-plug system, so there are four individual ignition coils and no traditional HT lead set. This setup is confirmed by Subaru’s 2016MY Impreza Service Manual ignition section and the official parts catalogue, which list ignition coils and plugs only.

What should be serviced instead of ignition leads on this model?

Focus on the iridium spark plugs at the scheduled interval (often around 100,000 km) and inspect the coil boots and electrical connectors for wear or contamination. If there’s a misfire, diagnose by cylinder and check the plug and its matching coil first.

Can aftermarket ignition leads be fitted to a 2016 Impreza?

No. There’s nowhere to fit them on a coil-on-plug FB20. Any “ignition lead kit” listed for a 2016 Impreza is likely miscategorised or intended for older EJ-series engines that used a remote coil pack and leads. On this car, the service parts are the spark plugs and, if required, individual coils.