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If you're working on a 2019 Jeep Grand Cherokee and need to change the fog light bulbs, the recommended size is H11. Swapping out the bulbs is a simple and easy task. Just remember that if you take out the rivets in the fender well to access the bulbs, you'll need to replace them as they are meant for one-time use. To replace the lights, reach underneath the fender well and locate two tabs, one on each side of the bulb. Gently separate them to detach the factory harness. Once it's disconnected, twist the bulb counterclockwise to remove it. Install the new bulb by twisting it clockwise to secure it, reconnect the harness until it clicks into place, and you're good to go. The typical cost to replace your fog lights should be around $15 to $30.
The fog light on the 2019 Jeep Grand Cherokee requires an H11 bulb.