Hello... I wonder if anyone have a idea,I had my car on service and that tire pressure warning start go off after i have drove a little while. I have chekked that the tires have exact same pressure,reset the button and it just start again and again. I called to the garage where i had service but he said it is no way it has anything to do with that and that i must pay for new trouble shooting(this is dealership and EXPENSIVE) It has never gone off before and the papers said that they have "chekked tire pressure" so i dont bye that. But on the other side i have chekked that the tires are the same pressure so. What can they have done??? Is it something i can try myself?? Like mayby lower pressure a bit or something?, or am i doomed to pay for new trouble shooting(it HAS to be something they did). Just thougt i ask here before i call and set up new hour for trouble shoot... At like 170$ pr hour....

 

You are going to need to first get the complete TPMS (tire pressure monitoring system) checked which is all the components to solve not as uncommon complaint. It is not just Mazda that this happens with.
Unless you have experience with knowing how to check the system then it is not recommended that you attempt a DIY diagnostic check.
I would however recommend that should you use a service shop make sure that shop employee and that you can ask that they be the one to diagnosis your issue is currently Automotive Diagnostic Technician, or a very current and experienced Mazda factory trained mechanic. Anything less you may be paying for more than an hour diagnostic fee. Under most circumstances it should only take an hour (1.5 hrs. at most) to diagnosis this issue.
Keep in mind that factors do not mention in most service guides, cautionary or advisories that can cause a single alert light TPMS are sudden psi changes in the tire both drop or + 5-& psi . Increases are generally caused from either the road temperatures and or driver steering input and overall age and condition of the tires. Mazda TPMS seems very sensitive to all of those.

This is not really that I know of any technical service testing method but if you are a DIY could try???
I suppose an easy DIY (do it yourself) test is to go for a early morning dive that is less then 55MPG on a nice, paved road and early enough that the sun has little effect on tire psi and road temperatures and see if the light activates. Then do the same midafternoon or when your weather service shows the hottest time of the day and repeat the test on the same test road and MPH .

Sorry cant advise where you go because you list NO as your country... LOL

 

Thank you for good answer.Country is Norway and it is actually unusually hot here this days,the sun is BRUTAL so mayby that is why it is unstabil. Also a friend told me(i just bought the car and i am green on cars) that i have not the right dimensjon tires and with low profil they are often very sensitiv,do you agree with that?? It is 225/45-18 tires on it. It is a 2015 Mazda 3 by the way.Now i start to think mayby very hot weather combined with those tires makes it go off very easy??It seems the car is also lowered,i did not even notice it when i bought it,that is how green i am.That brings out moore trouble for me becase i live a place where it is MUCH snow in the winter he he .But THAT is another story.ANYWAY i think you might be on to something with the temperature and i will try drive 05:00 in the morning for a long drive and see,i was out a short trip early this morning to the store this and it kept quiet then so...