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171 Mazda 6 DPF issue 'Soot accumulation in DPF is too high'

[Deleted User]

Hi guys,

Bought a 171 Mazda 6 (platinum auto model) last sept 2020. 63,000 km diesel.. Since sept I have done abt 6000 km, mostly motorway driving..

'Soot accumulation in DPF is too high' came up in Nov 2020, didnt go into limp mode... went back to garage and they did a manual regen. But same error came up again at beginning of Jan 2022, went back to garage and they ran a regen again, but they are also gonna clean the DPF. will this do the trick?

AFAIK, they obviously hooked up computer to run manual regen and no other error came up, i.e. no problem with some sensor etc...

Any help would be appreciated.. most expensive car I have bought and dont want issues :)

Cheers, C

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tibia

https://www.boards.ie/discussion/comment/118477852#Comment_118477852

"They are settling into a hot romantic session"

They weren't expecting it to reach 550 degrees C?

jmreire

No, they certainly were not... LOL 😂 I'm not 100 % sure but I think now that regens can only take place while the car is moving because of the high temps generated.

[Deleted User]

Just a quick update,

Left car into garage under warranty last Monday.. they are going to do their business, he said 'they would leave no stone unturned'? Hopefully..

Just annoying, as it will always be in the back of my mind, could be months, if the issue does come back..

Was talking to neighbor who has manual 151 Mazda 6, he really doesnt do long journeys at all.. Nowhere near my trips, mostly short trips and no issue with DPF. He does use Diptone every time he fills up.. so will give this a go when I get mine back :)

jmreire

It wont hurt anyway, but I would only put in the recommended amount. Good Luck anyway, and keep us updated, OK thanks.

John.G

https://www.boards.ie/discussion/comment/118459718#Comment_118459718

There doesn't seem much consistency with different makes/regens etc, a neighbour of mine had a diesel Skoda Octavia and used to do ~ 6000 kms/year, all short runs of around 10 kms/day with maybe a monthly 200 km round trip. He never had any trouble for the 5 or 6 years he owned the car.

My son-in-law had a diesel golf that did a 130km daily round trip but it used to do a regen maybe twice/week, it seemed to be time based but never caused a problem apart from a DP differential pressure switch that I replaced. It did around 350,000kms, only repairs being two front wheel bearings (+ 1 clutch).

Another thing I wonder about re the recommendation to drive in a lower gear(s) to help do a (passive?) regen, is this to maybe get a bigger air flow through the engine as driving in a high gear should thermally load the engine more, resulting in higher and more beneficial exhaust temperatures?.

John.G

The

VW DPF Regeneration.pdf

DPF regeneration processis very well explained here.

[Deleted User]

Just got car back..

They dropped the car into a specialist (I know the name but probably not supposed to mention here). They did the following:

Tested engine for faults, via computer - nothing showed up
Cleaned the EGR pipes
Did another regeneration
Put some cleaner fluid in it, he did not know what!
Went for a long run(s), they did over 200km in car, I noticed cause of trip counter!

Got an extension for an additional 2 months when the current warranty expires, this is just for DPF.

All in all not much was done..

Have a few records of the above on paper, so if worst comes to the worst, I have some evidence.....

And got meself some Diptane..

[Deleted User]

https://www.boards.ie/discussion/comment/118501053#Comment_118501053

TBH I feel its all a loada bo**ix, just an excuse garage / mechanics can use.

As you said, you know someone, and I know someone with diesel cars who do short trips and no bother.

If DPF issues arise, it is an actual issue with the car, not the way its driven..

[Deleted User]

Sell it for the next lucky owner. Give to him/her the boards link too, so we all can continue the same story. I am not surprised to see 200km driving for regeneration. They should change much earier the strategy, but looks like they did not had other cleaning options.

jmreire

https://www.boards.ie/discussion/comment/118506764#Comment_118506764

How cars fitted with DPFs are driven has indeed a very big influence on how they perform. Short start / stop trips are the death knell of DPF's. Yet different makes of cars behave differently when it comes to DPF Regens. Some do not need much driving to trigger a regen, and others need pedal to the metal for 20 miles for the same thing. But one thing is for sure, a blocked DPF is trouble, how ever its caused.

[Deleted User]

https://www.boards.ie/discussion/comment/118507360#Comment_118507360

Not soo sure.. the evidence doesnt support this theory..

Neighbour has had the same car as mine (tho 2 years older) for 2 years, and the car is nearly always in the driveway.. he admits himself he does very little driving, mostly short trips.. No problem with DPF

I dunno, maybe I'm just unlucky, Ive probably done more km's in 4 months than he would do in a year..

Anyway. lets see how it goes (with Diptane)....

jmreire

https://www.boards.ie/discussion/comment/118507596#Comment_118507596

Yes, it will be good to see how you get on. We are a " VAG" Family..Skoda's, Seats , Audi's etc. And pre-covid put up mega klms between them all, yet not one DPF problem. But there was one "back sheep" in the Family.... a Peugeot 508, which was driven mega klms too, and very well serviced but despite this we had to perform several forced regens on it. So I'm not claiming this as being the be all and end all on the subject, but personally If I was buying a car in the morning, and it was only for short distance driving, I'd go for a petrol one. Good Luck to you anyhow, its a right barsteward when you have a problem like you have, and especially under the circumstances, you have my sympathy.

John.G

Not sure but I think? all new turbocharged VAG petrol engines now have GPF, gasoline particulate filters, more fun down the line?, also, as a aside, you cannot now buy any new VW with a normally aspirated engine, next breathtaking development no doubt will be a turbocharged 2 cylinder engine, don't hear too much about the Fiat 500 twin air though.

jmreire

https://www.boards.ie/discussion/comment/118508704#Comment_118508704

ARGHHHHHHHHHHHHH😕😕😕

John.G

Here are a few DPF numbers from a 2010 diesel golf.

DPF Logs.docx

DPF differential pressure gauge renewed 23/7/2014

[Deleted User]

Too early to comment..

BUT so far so good. Have been using Diptane with every diesel fill, and driving harder than before... Will never know until the warning comes up again..

Still dont understand their 200KM trip when the specialist had the car, not sure what that proved, as it was a 2 month gap between when the first time the error appeared in Nov 21, and the next time in Jan 22.. I did a hell of alot more that 200km in that period. so all in all that useless test just cost me in diesel :)

jmreire

https://www.boards.ie/discussion/comment/118585023#Comment_118585023

I don't know much about the electrical process in the Mazda'a, but in the Mercedes Benz diesels, when a regen is taking place, extra loading is placed on the engine by increasing the load on the alternator, and this is achieved by turning on the heated rear windows door mirrors etc. So by attaching a cable to the live rear window connection, it will feed a bulb, which will tell you exactly when a regen is taking place, So you don't stop while the bulb is lighting. Result? No more uncompleted regens. And thereby stopping excess unburnt fuel finding it self mixing with the engine oil. Be worth checking out in your case?

CoBo55

https://www.boards.ie/discussion/comment/118467312#Comment_118467312

^^^^^^

This, no more no less. They're an absolute nightmare of an engine, get the egr delete done too.

jmreire

https://www.boards.ie/discussion/comment/118467312#Comment_118467312

Have you heard of anyone having NCT / Insurace issues after mapping / removal?

CoBo55

https://www.boards.ie/discussion/comment/118591251#Comment_118591251

Nope...

[Deleted User]

https://www.boards.ie/discussion/comment/118591251#Comment_118591251

They should scrap every deleted or mapped vehicle. It is illegal activity and must end now! Luckily the insurance does not cover anything if car is modified, so these modifiers get the punishment. I am really tired to see every day the hacked cars. I understand if everything works properly, go ahead. Unfortunately everything is made so poorly, these cars must classified as dangerous cars.

I like to understand, what is going on under these people "hood". Why they make such stupid things and pay big money for that scrappy job?

More waffles to my fanclub... Enjoy!

CoBo55

https://www.boards.ie/discussion/comment/118593498#Comment_118593498

Easy for you to prate on about it when you aren't footing the bills. Every dog and its owner knows that Mazda engine is a whole bag of trouble and the Op might never get it sorted, Mazda themselves have given up on that engine and point blank refuse to give any goodwill at all.

Op, cut your losses, keep your hard earned bobs and get it mapped out asap.

[Deleted User]

I would assume getting DPF mapped out, means bypassing DPF, sure this would fail emissions test for NCT.. and Im sure insurance would have a field day with this modification...

Both times in the past it went within 4-8 weeks, so far Ive had it back from garage about 4 weeks and have another 12 weeks on warranty for DPF.. if it does not come up by then I would be nervously OK with it.. Hopefully the Diptane and harder driving is doing the trick.

But in saying that, I will probably only hold the car for a year or 2 cause Ive lost confidence in it, pity cause it really is a lovely car

jmreire

https://www.boards.ie/discussion/comment/118599253#Comment_118599253

You are right about them being a lovely car, the BIL's have 2 petrol engined Mazda's, lovely to look at and lovely to drive. Never a problem with them...serviced on time, and drive on. But the diesel engine.....you are caught between a rock and a hard place my friend. Best thing is to plan on getting out of it ASAP. Just wondering ( I often do that... ) if it was a Mazda dealership you bought it from, would they have a petrol engined one you could trade it in against, for a reasonable price? I understand very well where you are coming from, and this may well be easier said than done, nonetheless, if the engine goes, and all the warranty is gone, then you would be in a worse position.

[Deleted User]

I know your right, and it wasnt a Mazda dealer.

Actually, thinking about this, or over thinking about this :) But should I really be using Diptane now, maybe dont use for the next 12 weeks (when warranty is finished). Possibly all Im doin is helping delay the re-occurance of the problem until the warranty is up??

Anybody got any stories of a DPF being actually fixed? Im hoping mine is :)

Im also hoping that if the issue does re-occur when the warranty expires I still have some recourse. Have written evidence that I have issue with DPF, so if occurs again outside of warranty, they didnt fix the original issue...

jmreire

I would not be using the diptane every single fill, maybe every 2nd or 3rd time might be enough? The Family "Fleet" consists of a mix of Seat Taracco, VW Passat, Skoda Superb's, Octavia, and they would generically be SAG. For non VAG, we have one Volvo S60 and one MB E class 220. They all have one thing in common though, all are diesel,and all have DPF. But we have not (so far) had any DPF issues, from any of them. So I'd be coming down on the side of Mazda have an engineering / design problem with their diesel engines. Even nowadays, in newer vehicles, DPF issues do not seem to be as common as they used to be. ( stop / start driving is still a big no no though) Yes, there are stories about successfull DPF cleaning, and re-setting. In the early DPF days, clogged DPFs were a very common problem. And if you Google, "DPF Cleaning" you will see what is available, and lots of reviews, prices etc. Might be an idea to give one of them a ring, and ask about Mazda DPF issues, If they can't tell you, no one can. The problem with Mazda seems to be that it is starting but not finishing regens...so each time you have failed regen, additional diesel used in the regen, find's its way into the oil in the sump, cauing the level to rise,,,,and therein lies the problem. Seems to be an engine management issue.

Hard to know how to advise you..just drive it and hope for the best, and plan for trading it as soon as you can. I wish you good luck with it anyhow, its a rotten situation to find your self in.

[Deleted User]

Just a quick update on this.

The error of soot accumulation has not come back yet..

However, due to all the failed regens in the past I decided to get oil change and a quick diagnostics before the warranty is up (should be up on 15th March)

Here is the report, this was done in a Mazda garage:

Have sent off email to garage I bought the car, waiting to hear back from them..

Seems form the fault too many regens are running now, so dont know how the original issue of soot accumulation arose?

[Deleted User]

And I suppose this issue will have an effect on fuel economy.. as the price of fuel is going up and up...

[Deleted User]

So DPF gone again, just this morning! Like right on time, seems to be very 6 weeks.. ‘soot accumulation too high’

back to garage again for the 3rd time.

would ya think the fuel injectors is the cause?

CoBo55

https://www.boards.ie/discussion/comment/118773583#Comment_118773583

If the garage agree to replace them it's definitely worth a try, they cost an open fortune so I can't see that happening. Controversial as it is but I'd definitely get the fcuker mapped, honestly this car could end up costing you an absolute fortune.