Well that question is too general. What year and what make is the vehicle? Is it a brand new key fob? If it is brand new it may need to be programed to the vehicle. The battery may be dead in the fob. The fob may also have a broken contact inside of it. I recommend taking your key fob and vehicle to the dealer for diagnosis.
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negative (no)
you need a new fob
No.
You put the key in the ignition and turn, you don't need a fob in order to start a car.
It is possible to program one key fob to use on two different cars. If the key fob uses a primitive fixed code system, programming two cars will not work.
Change the battery in your key fob. The directions should be in your owner's manual.
The key fob uses radio frequency signals to communicate with the car's security system. When the button on the key fob is pressed, it sends a signal to the car's receiver, which then unlocks the doors or starts the engine.
what is the reason for not fixing camera in key fob
i have had a new battery in my key fob, but it wont turn the engine on, do i have to get it tuned in to the electrics.?
Free On Board (FOB)
C200 key fob problem