How do I know it’s FBS3 or FBS4 key? (Solved)

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The easiest way to know Mercedes FBS3 and FBS4 difference is the digits.
7 digits = fbs3
8 digits = fbs4

You can judge by the outer shell… or maybe the numbers under the battery cover also

FBS4: Late 2015 for sure FBS4… 222, 231, 205, 117, 2012 model year and up 212 and 218, 166 and 190 Note that FBS4 was added to 212 207 etc at mid 2013 (804) not in MY 2012

Also, you can check SA Codes on vehicle data card or use any suitable online yin decoder to see SA codes related to your yin. You are looking for the presence of SA code 803 or 804, depending on the Model this means vehicle is FBS4 related. MY2013, Model 166 with Code 803, Models 207 and 212 with Code 804.

FBS4 models: April 2013 to Present, Model W212; July 2013 to Present, Models 166, 207, V212; September 2014 to Present, Model 218; November 2014 to Present, Models 117, 156; April 2015 to Present, Model 172; MY-All, Models 205, 217, 218, 222, 231.

FBS3: Early production 2015.
Applicable Models: April 2013 to Present, Mor’–12; July 2013 to Present. Models 166. 207, V212: September 2014 to Present, Model .18; November 2014 to Present. Models 117. 156: April 2015 to Present. Model 172; MY-All, Models 205, 217, 218. 222. 231

Important Note: Check Vedoc’s theft-relevant data section to ensure vehicle is FBS4: if the vehicle is FBS3 then there is no need to create an XSF case and a programmed key can be ordered as a normal TRP part.
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