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Discussion Starter · #1 ·
I couldn't help but notice that 6 of the current top 10 posts on the Gen 4 forum are rattle and squeak related. Any owners of both Gen 3 and 4 have an opinion on whether Gen 4 does indeed rattle more?

My 2017 Gen 3 has a few rattles, but is still pretty tight overall. I feel like both generations have high quality materials, with the Gen 4 obviously have even a higher quality, more expensive feel, but that doesn't seem to have translated into lack of rattles.

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Drive a 2018 3 hatchback grand touring. No squeaking or rattling issues.

Driving a loaner 2021 3 sedan right now with AWD and can confirm that road noise is reduced. The handling is a little less responsive. The cabin is nice, I prefer my Gen 3's though, and I haven't really noticed any rattling in the couple of days I've been driving it.
CK
 

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A lot more NVH in Gen 3 hiding or drowning out a lot of low level squeaking that would likely hear. The 4th Gen has a lot less NVH so you can hear things you would not in the 3rd Gen..
Gen 4 is a lot more quite then 3 Gen. I've owned both as well.
 

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It's a your-mileage-may-vary thing, when it comes to rattles. Sometimes when it's cold. Sometimes when it's hot. Sometimes the plastic just doesn't sit quite right.

But if you've goldilocks'd on the perfect unit, you won't come here to complain about it.

Also yes, 4th gen is quiet as heckin' heck.
 

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Discussion Starter · #5 ·
I figured the extra quietness of the Gen 4 was a big factor. I've had it all over the map. My 1997 Civic rattled after about 1000 miles, but once the dealer fixed that specific rattle, it wasn't too bad after. My 2003 Accord was tight as a drum and my Mazda3 is somewhere between those two.

In my experience, Nissans rattle like crazy.
 

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2021 turbo 3 owner here... Interior noise dampening is outstanding in gen 4 ... Yes the material used is very nice, all leather wrapped and stuff... But I am pretty sure underneath the leather wrapping is still pretty cheap materials being used haha... Because when you press on the leather panels, dash or whatever, you can hear all sort of noises. Fit and finish is what main stream vehicle you can expect, not full on luxury quality that is for sure.
 

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no rattles my 2019 model. when i learned of extraordinary effort to reduce noise in gen 4 i was sold. that said, 1 rattle for a few days came from overhead compartment where i had placed a pen and when i hit rough road it rattled.
 

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no rattles my 2019 model. when i learned of extraordinary effort to reduce noise in gen 4 i was sold. that said, 1 rattle for a few days came from overhead compartment where i had placed a pen and when i hit rough road it rattled.
You must have gotten lucky. Many 2019 models have had plenty of rattles. Most commonly from HUD, Infotament screen, glove box compartment dash area, Driver door / window / B pillar areas.
I have a 2021, assembled on September of 2020 in Japan. Still have rattle from Infotament screen , Driver door / window / B pillar area when going over bumps or uneven surfaces. I fixed the Infotament screen rattle by foaming it. Driver door / window chatter I don't believe I nailed a fix yet, still hoping for ideas here. Dealership was not really helpful in identifying rattles, unless there is a TSB for it or someone else also brought it in for same rattles, where they had experience fixing it from the past.

All these could be temperature related or the batch of parts that was used during assembly in Japan. It depends on where you live, and maybe the batch that was used to assemble your vehicle was problem free. And the batch that was unfortunately used in some of our vehicle might not be as good.
 

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I've had a gen 3 and 4. Once I figured out that the gas tank lid was causing a buzz in the rear of the cabin with every beat of music, I found the gen 4 to be at least as quiet as the gen 3 in terms of NVH. I have 2 tests, one with no music playing, going over rough roads and bumps. I don't want to hear any internal rattling, only feedback from the road itself. Second test is music playing loudly. When the bass hits, all I want to hear is SPL and no additional parts vibrating. I will say that it's very easy to cause a rattle if you don't put things back properly, as one post recently shows with the upper headliner console being out of whack, possibly from a botched TSB repair. My $.02.
 

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Well I must have gotten lucky too… 2019… 37000 miles… no rattles, even in our NY winters.
 

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I have a 2019 AWD 3 and my son has my old 2015 3. After 100,000 miles the 2015 is starting to have an annoying rattle or two. My 2019 3 with 25,000 miles is rattle free. I suspect most of the problems with the new generation are from the earliest of the 2019 vehicles.
 

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I have a 2019 AWD 3 and my son has my old 2015 3. After 100,000 miles the 2015 is starting to have an annoying rattle or two. My 2019 3 with 25,000 miles is rattle free. I suspect most of the problems with the new generation are from the earliest of the 2019 vehicles.
I wouldn't hold my breath to that haha. I picked up a 2021 turbo 3 japan assembled. Date of production is September of 2020. Now with 2500km (Canada) . I have 2 rattles that I can hear very annoyingly already. One being the infotament screen -(more like buzzing sound) . The other one is from driver door / window ? Infotament screen rattle is fixed by inserting a foam behind it. Window / door chatter rattle is still a mystery. Tried many methods found online and they all seem to be temporary fix ?
Temperature and humidity is a factor for sure.
 

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I have a 2019 premium model. Two noises that are bugging the hell out of me:

1.) When I accelerate, I hear a squeaking/cranking sound, almost like a spring is being compressed. I'm 90% sure it comes from the handle of the center console lid because when I squeeze the handle it makes a similar noise and I suppose there is a spring in there.

2.) When my kids are in the backseat and we go over bumps I hear a high-pitched squeaking noise that sounds like it might be coming from under the seat or the seat belt.

No rattles at all and otherwise a very quiet cabin. I also usually bump the bose system so a lot of times I can't hear anything but music blasting lmao. Are squeaks and rattles covered under warranty?
 

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Can’t comment on a third gen but my fourth has no rattles (as long as the sunglasses and wife’s accessories are properly placed). We sold the ‘19 super duty late last year ( I sold all the reasons to need it ) to plan for a car purchase this year, oddly enough when we bought it (truck) it had a rattle that was fixed accidentally by removing a trim panel and reinstalling, but I digress though, the Mazda is a fantastic vehicle with excellent build quality (I like fords too so I won’t dog them out ) oh and I have 9700 miles wear and tear on the car so far.
 

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I have had two Gen4s and both rattled like crazy. The first I bought new in mid 2019. Took it back to the dealer multiple times and they couldn't fix the rattles (I think they couldn't identify what the cause was). New Zealand has strong consumer law so after 3 months / 6,500 km covered they gave me a full refund on the car. I went to another dealership, explained what had happened and they said they could supply a rattle-free car and my last one was a lemon...so I bought another Gen 4 brand-new. And guess what? After a few thousand kilometres is developed the same rattles! I took it in to the dealer where they had a guy who specialised in rattles and squeaks. Drove around the streets with him and he identified the rattles as squeaks - trim rubbing against trim when the road services was a little bumpy. The solution was to apply an oil over the dash and in to all the cracks where different trim pieces meet. It eliminated 90% of the annoying sounds. There is just one small rattle left which is somewhere under the dash which I will try to fix myself.

When I was waiting for the rattles to be fixed, I was given two different cars to run around in as a courtesy vehicle, two different Mazda CX-30s. They each had similar rattles and squeaks.

So in summary, my experience is that Gen4 Mazda3s do have a lot of rattles and squeaks - and it can be frustrating identifying them and fixing them. Such a shame and very annoying because in every other way the car is brilliant.
 

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long term subscriber to consumer report mag here.. last 4-21 issue on gen4 model shows under" rattles/leaks" category from owner's survey an oddity that the 2nd year/2020 model has far more reported than 1st year/2019. seems really odd as 1st year models should be expected to have more. im interested in next survey from 4-22 issue.
 

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long term subscriber to consumer report mag here.. last 4-21 issue on gen4 model shows under" rattles/leaks" category from owner's survey an oddity that the 2nd year/2020 model has far more reported than 1st year/2019. seems really odd as 1st year models should be expected to have more. im interested in next survey from 4-22 issue.
this is very interesting . seems like they back peddling backwards lol
 

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I think there might be more buyers for the 2020 model year as it isn't the first year of the current generation.. lots of people wait for year 2 or 3 of a new generation car before pulling the trigger.
CK
 

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I think there might be more buyers for the 2020 model year as it isn't the first year of the current generation.. lots of people wait for year 2 or 3 of a new generation car before pulling the trigger.
CK
this is what I had in mind before buying my 2021 turbo 3. Since this gen came out for 2019, I thought it would be pretty safe to buy the 2021 models as most of the kinks and issues have been sorted out. But it seemed like I was wrong. A lot of the rattle noises had carried over to 2021 models without really being addressed. Of course not all, some are indeed fixed by now. I guess I had a high expectations going into this turbo 3 thinking, since Mazda made the cabin so upscale and premium, I should be safe.
 
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