How To Change Honda Civic Spark Plugs (With Pictures!)

Changing your spark plugs is easy – if you can use a wrench, you can change your spark plugs. It may be one of the easiest ways to save yourself over $100 in under one hour! The Civic shown is a 2006 LX, but it will be exactly the same process for any (non-hybrid) civic from 2006 – 2011, and similar for many other vehicles. Honda recommends changing the spark plugs at 100k miles.

Tools you’ll need:

  • Large flat-head screwdriver
  • Socket Wrench with Extension Bar (10mm socket and 5/8 spark plug socket)
  • Torque Wrench (optional – I don’t have one)
  • Dielectric Grease (optional – I didn’t do this)
First you will need to buy some spark plugs (Amazon, or your local auto parts store, can help you find ones that are compatible with your car). I bought these (You’ll need 4 of them!): NGK (5266) IZFR6K-11S Laser Iridium Long Life Spark Plug

The next step is to remove the plastic cover with your screwdriver for easier access to the wiring harnesses. A quick quarter turn of the plastic screws will free it on the top and then it unhooks on the front.

Next, disconnect the wiring harnesses:

Depress the grooved button on the top of the plug and wiggle it from side to side to loosen it. Once it loosens up it should slide right off.

Use your 10mm socket wrench to remove the nut that holds on the plastic cover – these cover and attach to the plastic tubes that carry electricity down to the spark plugs.

With those nuts removed, the plastic tubes pull out easily:

You will see the spark plugs at the bottom of the tubes in the engine:

With your 5/8 spark plug socket attached to the extension, unscrew the existing spark plug. They will take a little muscle to get started, but then they’ll unscrew easily.

After removing the existing spark plug, install a new one (after covering it with dielectric grease for additional sealing if desired) by hand-tightening it first and then using your wrench to tighten to 13-lbs. If you don’t have a torque wrench, just tighten it 2/3 of a turn past hand tight.

Marvel at how shiny your new spark plugs are compared to your dirty old ones:

Once all of your spark plugs have been swapped out, it’s just a matter of doing the first steps in reverse. Replace the plastic tubes, tighten them down with the bolts, re-attach the harnesses, and replace the plastic cover.
Congratulations on saving an easy $100+!

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