Replace The Spark Plugs And Ignition Coils on a 2017-up Toyota Camry
This guide covers how to change spark plugs and ignition coils on a 2017+ Toyota Camry equiped with a 2.5L 4 Cylinder A25A-FKS Engine. This engine is shared with the 2018+ RAV4, Avalon, and Lexus ES 250/260 so this guide may work for those vehicles as well.
This really is a pretty easy project, so I recommend giving it a try yourself if you've got the tools. Iridium tipped spark plugs can last up to 120,000 miles.
Remove Engine Cover
Remove the engine cover. It's foam, and it just pulls off.
Here's a photo of the back for reference.
Locate the 4 ignition coils.
Separate the electrical harness connector on each ignition coil you plan on removing.
As always, be careful with plastic connectors. As the car ages, the plastic tends to get more and more brittle.
Remove the 8mm screw on each ignition coil
Remove the spark plug. You'll need a 9/16" spark plug socket, extension, and a ratchet .
I was able to use a plain 9/16" deep socket without any issues because I use a hose to install the new plugs. That negates the need for the rubber fitting in a spark plug socket to keep the new plugs from falling onto their electrodes.
Install a new spark plug.
I use a 4mm (3/16") hose that slips onto the end of the spark plug fairly snug.
Slide the spark plug into the end and and lower it into the head.
The hose grips the plug lightly enough that it just allows you to rotate the plug a few threads in to get started without allowing you enough force to cross-thread it.
Install ignition coils.
They just slides into the hole easily. Give the coil a firm press down to make sure it seats fully onto the spark plug.
Install and tighten the 8mm bolt on each ignition coil.
Install the electrical connector to each coil.
Install the engine cover.