Heima
Posts: 159
Joined: Thu Feb 21, 2019 11:46 pm

Re: "Key Not Detected" can strand you, Solution Here

Mon Dec 28, 2020 11:10 pm

so this has me a little stumped.
There are 3 antenna to receive the keyfob ID. One near the driver door, one near the front passenger door, and one at the rear bumper.
if the presence of the keyfob unlocks the door, then shouldn't it also permit the vehicle to be started?
i had the key not detected problem in the past, replaced the fob battery, but still had the problem.
A workaround was to slap the fob between my hands.
The permanent solution was to remove the fob battery, expand the four fingers that contact the battery, so that they put greater pressure on the battery, and then close it all up.
It seems the fingers were just not making good contact with the battery, and after expanding them (be careful not to break them) the problem has not occurred since.

electrons
Posts: 141
Joined: Sat Jan 30, 2016 4:22 pm

Re: "Key Not Detected" can strand you, Solution Here

Tue Dec 29, 2020 3:51 pm

Heima wrote:
Mon Dec 28, 2020 11:10 pm
so this has me a little stumped.
Actually, this specific problem, by a poster with 1 post, is running up against the strict anti-Theft security Ford has built-in to it's vehicles to prevent a stranger from hopping in somebody's Ford & taking off with it!

If the poster has a real legitimate problem, as in the car's computer "forgot" what the internal security key FOB code is, as is alleged, THEN the only hope is to disconnect the 12v battery and maybe it will cause the computer to retrieve the code properly this time. It could be the previous 12v battery problem mentioned went through off-on-off-on bouncing, creating a possbile software initialization problem. Who knows.

Otherwise the owner needs to tow it to a dealership, prove owership, and they should be able to fix it.

HAPPYVEGHEAD
Posts: 1
Joined: Tue Aug 24, 2021 10:42 pm

Re: "Key Not Detected" can strand you, Solution Here

Tue Aug 24, 2021 11:21 pm

I can attest to the the disconnecting/reconnecting the 12 volt battery idea.

We have a 2015 model and have had issues with the 12 volt dying if the car isn't plugged in regularly. The Ford dealer said they resolved the issue the last time we took it in, but it stills happens if it isn't plugged in over a 3 day period which has happened a few times more than I'd like to admit during COVID.

This Monday the 12v battery was dead again, I left the battery hooked up to the car and I charged it for an hour Monday. Power was restored to the vehicle but neither key fob could be detected. I disconnected the battery for 30 minutes while charging the 12v a little longer, and then reconnected it and still neither key fob could be detected. I read something online that said if the 12v wasn't fully charged it might not recognize the key fobs.

Tuesday morning I hooked the battery charger back up and let it charge all day. Still could not detect the fobs that afternoon. I spent an hour changing out batteries in the fobs and searching online when I came across this post. I disconnected the battery again, this time left it disconnected for an hour, and when we hooked it back up it recognized both fobs. During the hour it charged we did log into myfordmobile.com and check alerts and settings, not sure that had anything to do with resolving the issue but wanted to throw it out there just in case.

Hopefully my post helps the next FFE owner that runs into this issue.

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