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RX 450h Spark plugs Install Guide

Your RX 450h

Pick your year to see what fits.

Restores lost power
Expert$60–$1103–5 hrs
All RX 450h mods

Why do it

Worn plugs cost power and smoothness.

Tools you'll need

Starting out? See our budget tool list.

Parts to buy

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Before you start

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

Steps

  1. Disconnect the 12V battery

    • Disconnect the battery and pull the plastic panels.
    Watch this step (How to Automotive, on a 2010-2015 RX 450h) (0:24–2:01)

  2. Clear the cowl

    • Remove the wipers, cowl and wiper motor.
    Watch this step (2:01–4:46)

  3. Do the rear plugs

    • Pull the coils and swap the plugs.
    Watch this step (4:46–6:04)

  4. Remove the upper intake

    • Take off the air cleaner and upper intake.
    Watch this step (6:04–11:02)

  5. Do the front plugs

    • Swap the plugs. Torque to 13 ft-lb.
    Watch this step (11:02–13:31)

  6. Reassemble

    • Refit everything.
    Watch this step (13:31–21:47)

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.

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