Thread: Custom Key RF transmitter

Forget all about reverse enginnering key fobs.
Key fobs use rolling codes to prevent nearby car thieves from reading the code with an RF-scanner when you press the unlock button and then be able to use this code afterwards.
If the key fob actually did send the same code each time the key was pressed then it would be way too easy for thieves to break into any car they wanted to.

http://en.wikipedia.org/wiki/Rolling_code

Rolling code
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A rolling code (or sometimes called a hopping code) is used in keyless entry systems to prevent replay attacks, where an eavesdropper records the transmission and replays it at a later time to cause the receiver to 'unlock'.

Such systems are typical in garage door openers and keyless car entry systems. The most widely spread algorithm for code hopping systems today is KeeLoq..[citation needed]

More in depth description of how rolling codes works and how car key fobs are reprogrammed
How Remote Entry Works http://auto.howstuffworks.com/remote-entry2.htm

Some microcontoller specific reading about rolling codes:
Atmel AVR application note AVR411: Secure Rolling Code Algorithm for Wireless Link http://www.atmel.com/dyn/products/ap...?family_id=607
Microchip PIC with KeeLoq http://www.microchip.com/stellent/id...GE&nodeId=2074

You are probably best off buying a new original key from your Peugeot dealer and have them progamming your car to pair it with your new key.

Here's how to re-synchronize a key if an already programmed key has lost synchronization with the car:
PEUGEOT 406 PLIP - Remote Key Programming http://www.programyourkeys.com/Peuge...tructions.html

http://www.programyourkeys.com/Key_P..._Services.html

Auto Car Key Transponder Services

For some cars specialist hardware is required to re-program the vehicle keys.

The normal course of action would be to use your main authorised car dealer but this can prove very expensive.
Luckily, there are numerous auto locksmith companies available offering re-encoding other than using your main authorised dealer.
There are companies that will produce master keys or re-encode your transponders. If you've just lost your keys and your car is parked where it will attract fines or even removal calling an on-site auto locksmith specialist is probably your best bet.

Before you call the company check all your car's paperwork. Most cars have a code card supplied when new. Check your car's manual and service book folder for this. This code may be required when creating new master keys. The alternative may be far more expensive so make a thorough check for this information.

http://uk.answers.yahoo.com/question...6154508AAzVO5m

hi there,i am a peugeot mechanic and do this procedure all the time it does not programme the key it simply sinc the key to the car if the car starts with the key its programmed all ready.to get a key programmed you must plug the computer at peugeot into th the car and can be costly.the instructions you have is to sinc the key the easy way to do it is put the ignition on hold the big button on the key in for 30 sec let button go pull key out and try it if it doesnt work there could be a fault with the receiver on the car.the key and the remote work like a tv remote same principle. hope this helps best of luck.Brian