Gather Necessary Tools and Materials

• New spark plugs compatible with a 2016 Honda Accord.
• Spark plug socket and ratchet.
• Torque wrench.
• Socket extension (optional, depending on engine layout).
• Gapping tool.
• Anti-seize compound (optional, but can ease future removal).
• Dielectric grease.
• Safety glasses and gloves.

Ensure Safety First

• Make sure the engine is turned off and completely cool to avoid burns or other injuries.
• Disconnect the negative battery terminal to prevent accidental electrical shorts.
• Wear safety glasses and gloves for protection.

Locate the Spark Plugs

• Open the hood and locate the engine's cover. On most Honda Accords, this is a black plastic cover that can be removed by unscrewing a few fasteners.
• The spark plugs are connected to the ignition coils. On a 2016 Honda Accord, they are usually located on the top of the engine.

Remove the Ignition Coil

• Disconnect the electrical connector from the ignition coil.
• Unscrew the bolt securing the ignition coil to the engine.
• Gently pull out the ignition coil. Be cautious not to damage the coil or any surrounding components.

Remove the Old Spark Plug

• Attach the spark plug socket to the ratchet and carefully insert it into the spark plug well.
• Turn the ratchet counterclockwise to unscrew and remove the old spark plug.
• Inspect the removed spark plug for signs of unusual wear, oil, or soot, which could indicate engine issues.

Prepare and Install the New Spark Plug

• Check the gap of the new spark plugs using a gapping tool. They should be gapped to manufacturer specifications.
• Apply a tiny amount of anti-seize compound on the threads (optional). Be cautious not to get any on the electrodes.
• Carefully insert the new spark plug into the socket and gently lower it into the spark plug well.
• Hand-tighten the spark plug to avoid cross-threading, then use a torque wrench to finalize, ensuring it is tightened to manufacturer specifications. Excessive torque can damage the plug or engine.

Reinstall the Ignition Coil

• Gently place the ignition coil back over the new spark plug.
• Secure the ignition coil with the bolt previously removed.
• Reconnect the electrical connector to the ignition coil.

Repeat for Each Spark Plug

• Repeat the removal and installation process for each spark plug. Most 2016 Honda Accords have four cylinders, so you will typically have four spark plugs to replace.

Reattach the Engine Cover and Battery Terminal

• Once all spark plugs have been replaced, reattach the engine cover by securing it with any fasteners or bolts that were removed.
• Reconnect the negative battery terminal to restore power to the vehicle.

Test the Vehicle

• Start the engine to ensure it runs smoothly. Listen for any unusual sounds, which could indicate improper installation or another issue.
• If the engine runs smoothly, congratulations, you have successfully changed the spark plugs on your 2016 Honda Accord!