After a few years of daily use, the battery inside the combination metal ignition key and key fob remote control for an eleventh generation (2014, 2015, 2016, the revised 2017 and 2018 model years) can become weak or stop working entirely. Check out my DIY tutorial for changing the key fob battery (with the replacement part number) by clicking on the text link or thumbnail image below.
2014-2018 Toyota Corolla Key Fob Battery Replacement Guide
