How to tell BMW U Chassis BCP key frequency 315MHz vs 433.92 MHz vs 433MHz?
First, we can use the key tool to read the frequency. It’s easy to distinguish between 315MHz and 433MHz, but it’s difficult to differentiate between 433.92, 433 and 434 MHz.
We can tell BCP key frequency from PCB.
315MHz: US models
433.92MHz: Korean models
433/433MHz dual: Chinese models
434MHz: European models
This inductor on this key board from Korea is black color, which is different from the ones used for other frequencies (blue color).
For the 315MHz circuit board, there is an additional component in this location.
If this inductor here is blue and there are no extra components, then it corresponds to 434Mhz or 433 MHz. For EU or UK regions is 434MHz, Chinese market dual 434 or 433 MHz (Once the frequency is locked, it cannot be switched).
We can also tell the frequency from BCP key shell.
Identifying these key fobs helps us purchase the correct keys.
