You can plug a OBD2 scanner and see the code.

https://mazda3revolution.com/forums...iv-discussion/211458-2010-mazda-3-gt-airbag-light-flashing-error-code-19-a.html

 

Thanks, is there anywhere I can find a codes list online, I don’t have a scanner and would rather not waste money on what could be a simple fix.

 

Did you ever figure this out? My 2010 3 Sport just started this 2-flash/3-flash thing yesterday while driving with a passenger.