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the difference between s and sa key?

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Old Dec 18, 2011 | 02:40 AM
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FUJINAMI1293's Avatar
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the difference between s and sa key?

hey there im new here and ill be buying my self a truck in a few days yes a ford.
now i have a question ive noticed on the ford keys for the newer models 2008 and up they have s and sa stamped into them and was wondering what the difference is between the two keys
Thanks
 
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Old Dec 28, 2011 | 09:13 AM
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ccerniglia
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Originally Posted by FUJINAMI1293
hey there im new here and ill be buying my self a truck in a few days yes a ford.
now i have a question ive noticed on the ford keys for the newer models 2008 and up they have s and sa stamped into them and was wondering what the difference is between the two keys
Thanks
Its Encryption. S keys are Ford old PATS (passive aint-theft system) 40 bit encryption, the newer SA is an 80 bit encrytion that is backward compatible with old PATS using cars. Hope this answered your question.
 
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Old Dec 28, 2011 | 07:15 PM
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Ford has went to "chipping" their keys? I know GM dabbled with it in the late 90's early and had some issues. We had to clean the contacts on the key with a pencil eraser. The chips were nothing more than resistors the computer read. If it didn't read the correct resistance programmed for that car it wouldn't work.
 
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Old Dec 28, 2011 | 10:54 PM
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Originally Posted by SasquatchZilla
Ford has went to "chipping" their keys? I know GM dabbled with it in the late 90's early and had some issues. We had to clean the contacts on the key with a pencil eraser. The chips were nothing more than resistors the computer read. If it didn't read the correct resistance programmed for that car it wouldn't work.
Ford has used a PATS system for their vehicles starting in the late 90's/early 2000's, although the Super Duty didn't get PATS until 08+. The Ford system is much more reliable than GM's early endeavors.
 
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Old Dec 28, 2011 | 11:18 PM
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In Canada the CMVSS requires all cars 2007 model year or newer to have some form of immobilizer... many automakers went with some variant of a RFID device. This is a non contact system so there won't be issues with dirty electrical contacts. It's like those keyfobs or ID cards to get into a commercial building / multi dwelling unit or those contactless smartcards to log on to your computer.
 
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Old Dec 28, 2011 | 11:47 PM
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Originally Posted by TRENT310
In Canada the CMVSS requires all cars 2007 model year or newer to have some form of immobilizer... many automakers went with some variant of a RFID device. This is a non contact system so there won't be issues with dirty electrical contacts. It's like those keyfobs or ID cards to get into a commercial building / multi dwelling unit or those contactless smartcards to log on to your computer.
I know what you're talking about. It's called Passive Keyless Entry. It uses a small rfid or similar device to activate a lock etc without physical contact. Pretty cool stuff. You can buy kits to add that to your home or car.

Keyless Ignition RFID Push Button Start systems
 
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Old Jan 13, 2012 | 07:37 AM
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ccerniglia
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From: Bristol, CT
Originally Posted by SasquatchZilla
I know what you're talking about. It's called Passive Keyless Entry. It uses a small rfid or similar device to activate a lock etc without physical contact. Pretty cool stuff. You can buy kits to add that to your home or car.

Keyless Ignition RFID Push Button Start systems
To give a bit more history, the first cars equipt with PATS (Passive anti theft system) was the 1996 Taurus. From then on Ford has added it to to just about every car.
 
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Old Jan 30, 2025 | 01:36 PM
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No sir

Originally Posted by ccerniglia
Its Encryption. S keys are Ford old PATS (passive aint-theft system) 40 bit encryption, the newer SA is an 80 bit encrytion that is backward compatible with old PATS using cars. Hope this answered your question.
I have been a ford tech for 30 years and SA keys are NOT backwards compatible with S keys regardless of what Ford says.
 
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