Mazda Forum - Mazda Enthusiast Forums

PM sensor replacement

Jolbo91 — Fri, 05 Jun 2026 11:53:19 GMT

Hello all,

I was just looking for a bit of advice regarding a Particulate Matter sensor replacement on my 2020 Cx-5 2.2 Skyactiv-D. I'm UK based, I called 3 garages all listed as Mazda specialists about having this item replaced. Two told me it would need to go in for some sort of programming at Mazda and one said he can just do it there and then. I wanted to understand the process and if it does in fact need to go to Mazda for this specific job, I tried to do some research to further understand. From the information I found online It could possibly need a DCU logic reprogramming, however I also read that as the car is 2020 (September 2020) it should already have the correct logic update, paired with the fact the part that is coming off is the Bosch revision B (SH9P-18641B) version already too. Naturally I only have access to the information google/AI will give me and I know this doesn't mean it's correct information. If anyone can elaborate on the actual replacement process as a whole I would really appreciate it. My understanding that it is either:

A) Replace part > DCU reprogramming > forced regen > reset learned values from old sensor > oil + filter change.
B) Replace part > forced regen > reset learned values from old sensor > oil + filter change
C) Something different entirely

The last garage I spoke to told me if the Mazda side isn't performed it can lead to the natural regen cycles not happening, subsequently a blocked DPF and possible catastrophic engine failure.

Thanks
Daniel

New member

Getars — Fri, 05 Jun 2026 08:43:12 GMT

Hey everyone! Just joined the community and wanted to say hi. Nice to meet you all, and I�m excited to get to know everyone and join in on the discussions. Owner of 2014 Mazda 3 GT.

DPF Malfunction

Thphilpott — Thu, 04 Jun 2026 15:46:02 GMT

Hello

First time poster here - forgive me if this is a naive question.

My Mazda CX5 (Diesel Sport Nav D 4x4 Auto, 2015, just over 64k miles) has the orange triangle warning light and a message on the dash saying �DPF malfunction�. I�m away from home and I took it to an official Mazda dealership who ran the diagnostics (at great expense) and wrote �carried out MMDS check and found DTC P243C regen frequency, checked DTC store record and found DTC P2262 small turbo area malfunction, will require stripping to inspect turbo and intake system�.

I am presently over 100 miles from home on work business. I am due to drive back tonight.

What are my odds that the system puts me into limp mode half way back? I don�t really have an option of not trying to get back but I am very nervous that I am going to break down on the Motorway.

Any advice greatly appreciated.

Help with this rattling noise

07Black6 — Tue, 02 Jun 2026 20:32:37 GMT

I�ve attached a video, because it�s far easier than explaining the noise. It�s an �07 2.3L and zero DTCs and the noise is very inconsistent. I don�t think it�s a severe engine related noise, because it only does it in gear and never while idling. It seems to pop up most when I accelerate from a stop, or if I apply sudden acceleration while moving. I realize it could be a multitude of things, but it would really help to narrow it down.

Attached Files

IMG_2621.mov (1.13 MB)

Taking CX-60 to France

MG1066 — Mon, 01 Jun 2026 06:50:01 GMT

I am take a CX-60 with matrix headlights to France for a week.
Any recommendations on what vehicle settings to change and what to do regarding the headlights, a quick search on the internet gives conflicting information. Some say use the stick on deflectors others say leave them they will sort themselves out.

Thanks in advance

Mazda CX90 GT-P - Looking for real world towing experience

mbatson89@googlemail.com — Sun, 31 May 2026 01:40:07 GMT

Hi,

I'm looking at getting a travel trailer to pull behind our GT-P. I've looked today at a trailer with a dry weight of 3,100lbs.

Getting some very conflicting opinions and advice about whether this is too heavy so looking for some real world experiences from others with this vehicle.

Is a 3,100lb dry weight realistically a good idea within the GT-P Ps 5,000lb capacity?

Can anyone with experience towing a similar weight trailer offer any real world feedback to help with the decision?

TIA!

Hunting down a misfire

Mazdawarrior — Sat, 30 May 2026 05:10:10 GMT

Hi Protege-heads out there.
I am hunting down a misfire that keeps evading all of my best efforts over the last 6 months but It has reached, gotta deal with it proportions because now my wife hates to drive the car. I have a 1997, 323 Protege BA 1.6L. The only car I have ever owned, and although I know that sentimentality can only get me so far I hope the old girl has a few more years in her.

In the period that I have been dealing with the misfire I have tried the following.
1. Replaced the spark plugs
2. Replaced the ignition leads and packs
3. Replaced the fuel pump (because it died :()
4. Replaced the fuel filter
5. Changed oil & filter every 5,000km-10,000km
6. Had a mechanic replace the valve cover seal gasket.

As I am starting to head toward more expensive repairs I am looking for assistance on what I should look at next?
Please help me protege protectors,
Thanks in advance for your tips and tricks.

"Very small" main seal leak

miltbaker — Thu, 28 May 2026 14:49:14 GMT

I have a 2021 Mazda CX-5 Grand Touring that I purchased new. I did not purchase or pay for an extended warranty. The car has just under 36,000 miles. My excellent mechanic discovered a "very small leak" at the main seal between the engine and the transmission. There have been no dashboard warnings or trouble lights either before or after the discovery. The mechanic says I should take the car to Mazda if I have any warranty coverage left, but I checked and found that I am 4 months past the 60-month warranty, so I cannot expect any help from Mazda.

The car is based in South Florida and lives a charmed life. I have a 50/50 mix of city and highway driving, don't drive it hard or aggressively, never drive off-road, change oil and filter every 6,000 miles (usually sooner), and the car drives and behaves like it's brand new. I religiously check the oil dipstick at each gas fill-up, and I have never seen the oil level vary.

My trusty mechanic says the small oil leak issue isn't due to anything I've done. He calls it a "nuisance leak" and says my best course of action is to continue driving and maintaining the car as usual, being extra careful to check the oil level frequently. He says the leak will most likely remain very small and should not affect the car's longevity. In fact, he said the engine will likely be good for at least another 20,000 to 30,000 miles if I continue to care for it as I have over its first five years/36,000 miles.

Just wondering if anyone here has had a similar nuisance leak, when it occurred, and how it's played out over the long term.

Many thanks,

Milt Baker, Pompano Beach, Florida

Premature tensioner failure?

AMS — Thu, 28 May 2026 13:28:48 GMT

Gates premature tensioner failure?2019 CX5 no turbo, 75.5k miles Hi all, i am seeking advice/experience regarding belt tensioners. Replaced the belts and tensioner with the Gates 90K-39390 kit. I replaced the OEM belts about 10k miles aho Started chirping a few months ago and it seems like the wheel is rubbing against part of the assembly. Has anyone else experienced this? Considering buying a new OEM (INA on rockauto is about $100 less...) tensioner and an OEM stretch belt. I saved the original tensioner and am considering putting that back on. Pics attached for wear progression

Mazda 2015 cx-5

Barry Dennehy — Thu, 28 May 2026 00:34:57 GMT

Hi all , New to forum.
Trying to get files to OS version from 51.00.351 to 70.00.100A has anyone link to set up my USB STICK
Thanks in advance

Water in passenger floor - does not appear to be usual causes

WolfStock — Wed, 27 May 2026 11:18:00 GMT

Hi all - thanks for any thoughts on this.

My daughter has a Mazda 3, and twice now has had a problem with water getting in the passenger floorboards. The circumstances are mysterious, such that I don't think the cause is one of the usual suspects (sunroof, AC drain, cowl drain).

She's had the car almost two years, and it's happened only twice, at least as far as we can tell. (there haven't been any other times where anyone's noticed water, nor has there been any smell).

She's in college, and doesn't drive the car long distances or highway speeds while there. The only times she drives it highway speeds is when coming home (e.g. now for summer). Both time's it's happened has been during these times.

It's parked outside always. Last year when this happened I got into the car when it was raining, and saw no evidence of any leaking. This is why I'm pretty sure it's not the cowling draing or the sun roof drain - if it was it would get wet more often, during rain events.

Similar for the AC drain. That would be a more slow leak, and would happen more often, when she runs the AC. In these cases though it's been about a gallon of water I've pulled out (via shop vac and/or towels).

So what I'm thinking is that the water may actually becoming up from *below* when she drives in the rain at higher speeds, which she did the other day. Like maybe from tire splash. I don't see anything wrong with any of the splash guards or the like - everything looks to be in place, and looks the same on the passenger and the driver side.

Thoughts? Anyone else seen anything like this?

2012 Mazda 3 6 speed MT 2.5L

Yanlex — Mon, 25 May 2026 14:53:15 GMT

On my 2012 Mazda 3 I'm been replace the Main oil seal the one goes behind the Flywheel and still have oil leak.i don't know if I need a special tool for install. Any suggestions

Trunk won't open

Sandyfoot — Mon, 25 May 2026 05:42:54 GMT

Just picked up a 2010 hatchback and guy i got it from says the trunk was opening but he seemed a bit sketchy to be honest . I've ohmed out the release button since this seems to be a common issue and it reads fine . Next went to apply 12v directly to the latch and she made a weird noise and popped . Now it reads open when read 1.8 before , so I know ive smoked the latch and will need a new one . But before it never hummed or anything when pressing the button , I dont have a keyfob ..dont know if that helps but any info would be.much appreciated

Part identification

Bruin24 — Sun, 24 May 2026 22:12:24 GMT

Have a 2020 Mazda 6 2.0 SkyActiv G Touring. I found a slight coolant leak when looking over the engine. Definitely leaking there because I cleaned it off and it came back in the same spot after a few weeks. For the life of me, I have been unable to identify the part after days of research. I�ve attached pictures and circled the part in red. The purple area is where it is leaking. No puddles of coolant, just dried coolant, so I believe it just started. The part is bolted on the back of the engine block on the right side. It appears to be attached to the thermostat housing. The hoses running back to the dash go directly to the heating core. The third picture shows the whole part and the dirt around the part is the coolant I brushed off the nipple that is leaking. Check engine light has not come on. Any help would be greatly appreciated.

CX-9 liftgate close button not working

jonheil — Sun, 24 May 2026 20:53:24 GMT

Anyone have an issue with only the close button not working? This is the button on the underside of the liftgate on the inside, to close it. Liftgate closes fine using the dash button, keyfob, and outside button near the license plate. Anyone have a p/n for this switch?