If you’d like to check or change the spark plugs in the 2GR-FE 3.5L V6 engine of your fourth generation (2013, 2014, 2015, 2016 and 2017) Toyota Avalon, check out my DIY tutorial for the procedure (with the compatible replacement part numbers) by clicking on the text link or thumbnail image below.
2013-2017 Toyota Avalon 3.5L V6 Engine Spark Plugs Replacement Guide
