I have the fob key remote start on my 2011. The wife added it as a Christmas present several years ago. She took it to the dealership and had it installed.
I replaced my Motorcraft battery after about 5 1/2 years with a yellowtop. I bought the felt pads on a whim and they work great. My truck is not a daily driver and the Optima has not failed me over 3+ years. I use a battery tender when I know it will be sitting for extended periods.
Check under the hood, near the coolant reservoir on the driver's side. There is a switch that must be depressed when the hood is closed in order allow the remote start to function. Chech the switch and the plug to the switch; if it's bent down or if the plug is dirty you might be able to solve...
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