After a couple of years of daily use, the small coin cell battery inside the “Intelligent Access” or “Smart” key fob remote control for the keyless entry and push button start systems of a sixth generation S550 2015, 2016, 2017, 2018, 2019, 2020, 2021 & 2022 Ford Mustang may become weak or stop working entirely. Check out the DIY tutorial for the procedure (with the compatible replacement part number) by clicking on the text link or thumbnail image below.
2015-2022 Ford Mustang Key Fob Battery Replacement Guide
(Supposedly the next 7th generation “S650” Ford Mustang will not be unveiled until late 2022 as a 2023 model year vehicle.)