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The iridium tipped OEM spark plugs in a 4th generation (2016, 2017, 2018, 2019 and 2020) Kia Optima sedan with the Theta II 2.4 liter GDI inline four cylinder engine should be replaced at 105,000 miles according to the owner’s manual. Although they should be checked and possibly need to be changed before that mileage. To view my DIY tutorial for the procedure (with the compatible replacement part numbers) by clicking on the text link or thumbnail image below.

2016-2020 Kia Optima Spark Plugs Replacement Guide

If you’ve been having difficulty starting the Theta II 2.4L I4 engine in your 4th generation (2016, 2017, 2018, 2019 and 2020) Kia Optima on a cold morning and the original battery is a few years old, you probably need to replace it. Check out my DIY tutorial for the procedure (with the OEM group side and the compatible replacement part numbers) by clicking on the text link or thumbnail image below.

2016-2020 Kia Optima 12V Automotive Battery Replacement Guide

If you need to change a burnt out front turn signal light bulb in your fourth generation 2016, 2017, 2018, 2019 and 2020 Kia Optima sedan, check out my DIY tutorial for the procedure (with the compatible replacement part numbers) by clicking on the text link or thumbnail image below.

2016-2020 Kia Optima Front Turn Signal Light Bulbs Replacement Guide

The headlight housings of a 4th generation (2016, 2017, 2018, 2019 & 2020) Kia Optima contain the low beam, high beam and front side marker light bulbs. Check out my DIY tutorial for the procedure (with the compatible replacement part numbers) by clicking on the text link or thumbnail image below.

2016-2020 Kia Optima Headlight Bulbs Replacement Guide

If you need to change the engine air filter element for the Theta II 2.4 liter inline four cylinder GDI engine, check out my DIY tutorial (with the compatible replacement part numbers) by clicking on the text link or thumbnail image below.

2016-2020 Kia Optima Theta II 2.4L I4 Engine Air Filter Replacement Guide

The best place to start when troubleshooting any electrical problem with your 4th generation (2016, 2017, 2018, 2019 & 2020) Kia Optima sedan is to check for a blown electrical fuse or a faulty relay in either the engine bay or the interior passenger compartment electrical panels. Check out my DIY tutorial for the procedure (with the compatible replacement fuse types) by clicking on the text link or thumbnail image below.

2016-2020 Kia Optima Electrical Fuses Replacement Guide

If you need to change a burnt out cargo area light bulb in the trunk of your fourth generation (2016, 2017, 2018, 2019 & 2020) Kia Optima sedan (or upgrade it to a brighter LED bulb), check out my DIY tutorial for the procedure (with the compatible replacement part number) by clicking on the text link or thumbnail image below.

2016-2020 Kia Optima Trunk Cargo Area Light Bulb Replacement Guide

If you need to manually move your fourth generation (2016, 2017, 2018, 2019 & 2020) Kia Optima, you’ll need to release the shift lock mechanism in order to move the gear selector (shift knob) from “Park” to “Neutral”. Check out my DIY tutorial for the procedure by clicking on the text link or thumbnail image below.

2016-2020 Kia Optima Transmission Shift Lock Release Guide

I decided to upgrade our 2010 Toyota Corolla S with much brighter LED  bulbs for the low beam headlight and the front turn signal lights. Check out my review of the LASFIT LED light bulbs by clicking on the text link or thumbnail image below.

LASFIT Auto LED Light Bulbs Review

If you need to change a burnt out reverse (also known as the “back-up”) or parking light bulb in the inner tail light housing attached to the trunk lid of your 4th generation (2016, 2017, 2018, 2019 & 2020) Kia Optima sedan, check out my DIY tutorial for the procedure (with the compatible replacement part numbers) by clicking on the text link or thumbnail image below.

2016-2020 Kia Optima Reverse & Parking Light Bulbs Replacement Guide