In this guide, you will find instructions with pictures and video clips that will help you change the spark plugs on Hyundai four-cylinder engines found on Elantra, Sonata, Santa Fe, Veloster, Accent and other models. 

If your Hyundai check engine light is on or you have over 100,000 miles on your Hyundai, it may be time to change the spark plugs. 

What you will need

  1. Hyundai Spark Plugs
  2. Spark Plug Socket
  3. Ratchet
  4. Ratchet Socket Extension
  5. Torque Wrench

Procedure

  1. Park your Hyundai in a safe area, set the parking brakes and allow the engine to cool down. 

  2. Open Hood Next open the hood. Clean the area around near the spark plugs and around the ignition coils. 

  3. Disconnect the negative battery terminal. Since you will be working with the electrical system it is a safe practice to disconnect the negative battery terminal. 
  4. Remove the engine cover. It is held in place with up to four 10mm bolts that you can access from the top of the engine. If there are no bolts on top of the engine cover, simply pop up the cover. replace spark plugs hyundai elantra Spark Plugs Replacement Guide Hyundai Elantra 2012 2013 2014 2015

  5. Remove ignition coils. Next, remove the engine cover and disconnect the ignition coils. Unplug the ignition coil connector by pressing the locking tab and then pulling the connector away. Hyundai Elantra Spark Plug Change Remove Replace Yourself DIY Guide

  6. Use a 10 mm socket to loosen the bolt that secures the coil in place. This vehicle uses coil-on-plug design, therefore you will have one coil on each spark plug. Once the bolt and connector have been removed pull the ignition coils out. If the ignition coil refuses to come up try twisting it slightly then try lifting it up and out.
  7. Remove spark plug. Blow dirt away from the spark plug recess before you remove the spark plugs.

  8. Use the spark plug removal tool, ratchet and a 3/8" extension to remove the spark plugs from the engine. Rotate counterclockwise to remove the spark plug. You may need to use a magnetic pickup tool to pull out the spark plug.
  9. Install new spark plugs.  It is time to install the new spark plug. It is a good practice to inspect the gap using a spark plug gapping tool. Certain spark plugs may come pre-gapped while others such as copper plugs should be gapped.

  10. Install the ignition coils and connect the electrical connector to each coil. Reinstall the engine cover.
  11. Remove all tools from the engine. 
  12. Start the engine and check the operation of the vehicle. 

If the check engine light was on due to a bad spark plug or ignition coil, clear the codes with an OBD-II scanner. 

Recommended Spark Plugs for Hyundai

The original spark plugs installed on Hyundai equipped with the four-cylinder engine are NGK or Denso iridium coated spark plugs.

Below we have listed two highly rated spark plugs that will fit Hyundai vehicles.

Frequently Asked Questions

According to the owner's manual of a 2016 Hyundai Elantra, the spark plugs should be replaced every 105,000 miles or 84 months. Keep in mind that depending on your driving style and conditions the spark plugs may last longer or need to be replaced as early as 60,000 miles. The original spark plugs are iridium coated.

Make sure to install replacement spark plugs with the correct heat range.

The OEM Hyundai spark plugs are NGK or Denso. Which one is installed on your car depends on the market where your Hyundai was sold?

Hyundai 18846-11070 1884611070

The average cost to change the spark plugs at the Hyundai dealer or an auto mechanic is between $180-$300. DIY cost (if you already have the tools) is under $50.

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