I just did a transmission pan, filter, and fluid change on my Mazda 3. Tip - there is a reverse plug on the pan you can remove to drain the fluid before removing the pan, less mess. I used Valvoline MaxLife ATF, around 5 quarts.

That loose part that plugs (loosely) into your filter is a heat sensor.

top tip: use silicone grease on a rubber gasket. that way it stays put and you can have your holes line up

Not an expert here , have read that automatic transmissions that have not had the fluid changed for a long time and likely worn internal parts get used to a certain viscosity and changing it too much in one direction can lead to shifting problems or even the end of a transmission prematurely. Some guys only drain about 2 quarts through the drain plug and then replace that much to the full level - less of a shock to the internals. One old mechanic said replace the tranny fluid and filter every 2nd or 3rd oil change and not stomping on the accelerator will make the tranny last longer .

For those that want to use a synthetic ATF instead of Mazda MV : Compared to Mazda MV : Motul Multi ATF is just a little too thick, Mobil 1 Synthetic ATF and Eneos Eco ATF are both just a little too thin. (Mobil 1 is also a little too expensive) But they are very very close .. so in fact they all work! I mix 2 liters motul with 1 litre of Eneos, so as to get closer to the original viscosity. (premix them to prevent foaming) Thick ATF is better for smoother shifting. Thin ATF is better for performance These three have almost the same viscosity when cold. Motul retains a little more viscosity when hot. The other two can not .. MV curve remains in the middle..

Seen you issues with your shifting. Check your Transmission speed control sensor. 100% Its going to be the TCM. . I bought a brand new from the stealership $700 there not cheap.

Change oil .after need good obd2 scanner

I've found if you pry the pan from a corner it comes loose a little easier.

Get the TCM Rebuilt, that’s most likely the reason

Anyone have a link where I can buy the Transmission Kit also I'm trying to go synthetic. 2006 Mazda 2.3 4 door hatchback..

I just recently changed my tcm but I did not put it back where it goes under the battery box I zip tied it to the back of the fire wall. Because that’s why they go out because of overheating and then it fry’s the tcm.

Did changing the fluid fix your shifting issue

Did you have to change the transmission fluid and tcm for the AT light to come off?

That's a transmission filter sensor

Just got my tcm for $240. Shit works great now...

Hello dear friend, can I ask why you don't change the gearbox oil with the device?

best way to remove the pan is to use a dead blow hammer and hit it from the side

Same problem with my 2004 mazda 3 AT light comes on then jerks changing gears. Don't think it my tcm because it's not located on the Trans.. did you figure out your problem with it?

Hello. How much new transmission oil had to be poured?

That's a Transmission Sensor

does this same issue w the tcm still happen with the 2011 mazda 3?

What engine size you have is it the same transmission for all Mazda 3 from 2004 to 2009

Thanks 🙏

ATF capacity?