lol, i love your edit jukka. Cause i went to the dealer and they looked at me like i was an asshole for thinking there was lifetime warranty on it. haha
anyways, yes, its 1 or 3 (1 is probably drivers side, and 3 is probably passenger side). Its easy to do. remove the seat (4 bolts) unplug it, unbolt the seatbelt/pretensioner assembly and remove the wiring, and reverse. took me about 20 minutes on my car, but i do this sort of work all the times in various mazdas at work.
EDIT: I should mention, that just because there is a code for the pretensioner, it doesnt mean its 100% the cause. it could be a wiring/module issue as well, however, it is very common that these fail (although its usually the drivers one in my experience). So if you are okay with a 300 dollar guess (albiet an educated guess with about 90% chance of being right) then dive in brother.
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