hi I have a 2016 subaru crosstrek with a keyfob and i am not able to start my car. i just changed my battery and now my horn wont stop and car wont start my car doesnt have a place for my key to turn on and unlock the doors to disable an alarm or immobilizer. any tips on how to get my car running?

 

Being from the US of A your alarm systems are different to here in the UK but the keyless access system is similar.
Your key fob has an emergency key built into it for opening the drivers door lock manually





All the info you "should" need is in the "Owners manual" section 2 as supplied with the vehicle.
If you don't have one, then one can be downloaded from https://techinfo.subaru.com/stis/#/online_reference for free
or from HERE


Section2 pdf attached