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Ford Mustang Key Fob Battery Replacement Guide
How to change the battery in the Intelligent Access key fob for a 6th generation 2015 to 2022 Ford Mustang.

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2019 Mustang Key Fob
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Intelligent Access Fob
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Push In Release Button
This automotive maintenance tutorial was specifically written to assist owners of the S550 sixth generation 2015, 2016, 2017, 2018, 2019, 2020, 2021 and 2022 Ford Mustang in changing a weak or dead battery in the "Intelligent Access" (or "smart") key fob remote control for the keyless entry and push button start systems.

(The 7th generation S650 Ford Mustang is supposed to be released in 2022 as a 2023 model year vehicle.)

Owners of other Ford and Lincoln vehicles such as the Fusion, Taurus, Escape, EcoSport, Flex, Expedition, Bronco, Ranger, Transit, F-150, C-Max, Fiesta, Focus, Edge, MKZ, Continental, Corsair, Nautilus, Aviator and Navigator may also find these DIY instructions to be helpful.

The compatible replacement coin cell (also known as a "button" or "watch") battery is part number CR2450 which is available from various manufacturers such as Panasonic, Sony, Energizer, Maxell and Duracell.

The only tool needed to access and replace the battery is a small flat head screwdriver or a small plastic pry bar tool.

The first step is to locate the rectangular shaped black plastic release button on the front side of the fob just below the red "Panic" button.



 

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Slide Out Ignition Key
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Empty Ignition Key Slot
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Insert Screwdriver Blade
Push in the release button and slide out the backup / emergency metal ignition key.

Insert the small flat head screwdriver into the slot where the metal ignition key used to reside.

Gently twist the screwdriver to pry out the back cover of the fob.

Avoid using excessive force and do not insert the screwdriver too far into the slot.

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Gently Pry Off Rear Cover
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Re-Insert Screwdriver
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Back Cover Removed
Once the bottom edge of the rear cover has been released, remove and re-insert the screwdriver in between the side of the rear cover and the fob.

Continue gently prying out the rear cover.

Do NOT pry out the very top of the rear cover located close to the "Unlock" button.

There is a plastic tab on the top edge of the battery cover that can be bent or broken off if you pry near the top of the fob.

Lift up the bottom edge of the rear cover and pull the tab at the top out of its slot.

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Pry Out Old Battery
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Old Battery Removed
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Panasonic CR 2450 3V
Set the back cover aside in a safe place.

Use a small flat head screwdriver such as from a jeweler's screwdriver set, to carefully pry out the old battery from its socket.

Try to avoid bending the black metal retaining clips, scratching the green circuit board or damaging the silver metal electrical contacts.

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"+" Side Up CR2450
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Install New Battery
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Battery Secured In Socket
The OEM (original equipment manufacturer) coin cell battery was a Panasonic CR2450 3 volt.

If you look closely at the green circuit board, you'll see the instructions "+ Side Up CR2450".

Orientate the new CR2450 battery with the "-" negative side facing down towards the circuit board and the "+" positive side (with the battery part number and brand name) facing up towards you.

Lower the new battery into the socket and push it securely it into place.

Make sure the two metal retaining clips are in place and the new battery is fully seated in the socket.

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Line Up Tab - Top Edge
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Lower Bottom of Cover
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Gently Pop On Cover
Line up the plastic tab on the top edge of the battery cover with the slot at the top of the fob (close to the "Unlock" button).

Re-insert the tab at the top and then lower the bottom edge of the back cover (close to the "Panic" button).

Gently push on the rear cover to snap it back into place.

Make sure the back cover is flush with the rest of the fob at every edge.

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Slide In Backup Key
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Key Fob Re-Assembled
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Test New Key Fob Battery
Replace the backup / emergency metal ignition key by sliding it back into its slot.

You should feel or hear the ignition key "click" securely into place.

To test the new battery, stand near your Mustang and press the "Unlock" or "Lock" buttons on the key fob.

If the new battery is working properly, you should see the parking lights flash and also hear the door locks opening or closing.

(You should not have to reprogram the key fob. Just changing the battery should not clear the original programming from the factory.)

Be sure to write down the battery change in your vehicle's service records.

For more, please check out all of the 2015-2022 Ford Mustang DIY Repair & Maintenance Guides.
 

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