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Focus RS Spark plugs Install Guide

Your Focus RS

Pick your year to see what fits.

This page covers the US Focus RS.

Restores lost power
Easy$55–$8030 min
All Focus RS mods

Why do it

Worn plugs cost power on a turbo engine.

Tools you'll need

Starting out? See our budget tool list.

Parts to buy

Double-check fitment before buying. We may earn a commission when you buy through these links, at no extra cost to you.

Before you start

  • Work on a cold engine. Do one plug at a time.

Steps

  1. Gap the new plugs

    • Check the gap on each plug.
    Watch this step (CJ Pony Parts, on a Focus ST and RS) (0:33–1:14)

  2. Clear the top of the engine

    • Move the intake sleeve and cover.
    Watch this step (1:14–2:11)

  3. Swap the plugs

    • Pull each coil and swap each plug.
    Watch this step (2:11–2:57)

  4. Refit the coils

    • Refit the coils and cover.
    Watch this step (2:57–3:38)

How to know it worked

Did this guide work for you?

Safety first

  • Park on flat ground, set the parking brake and chock the wheels.
  • Never get under a car held up only by a jack. Use jack stands.
  • Let the engine and exhaust cool first.
  • Disconnect the battery before unplugging electrical parts.
  • Wear safety glasses.
  • If something doesn't match your car, stop and ask a shop.

Follow your part's instructions and your service manual's torque specs.

Spark Plug install guides for other cars

More Focus RS mods