I need a car charger for my iPhone 16 Pro Max

I'm going to assume your car is standard USB A and the cable you got with your iPhone 16 Pro Max is USB C. You have two options. Buy a USB C to USB A adapter or buy a USB C to USB A cable.

You can go to any BestBuy store and buy either an adapter or order either from Amazon.

Like the following:

https://www.amazon.com/Adapter-Anker-High-Speed-Transfer-Notebook/dp/B08HZ6PS61/ref=sr_1_3?sr=8-3

https://www.amazon.com/ANKER-Cable-iPhone-2Pack-Black/dp/B0CRZ4LR9K/ref=sr_1_4?sr=8-4

Note: Both options I chose are from Anker and they are a very good and reputable company and will surely work with your iPhone.

Go out and buy one. How old is the car, and what kind of USB connectors does it have (USB-A or USB-C) - check the manual if you aren’t sure how to determine. USB-A is a rectangular plug; USB-C is more oval.