Mazda 6 2014 2.2 Diesel engine problem.

mrkarlos

Hi all,
I’m looking for some help and advice please.
I have a 2014 2.2 diesel which has just over 79k on it. I purchased it from new, having it serviced by Mazda with all the recommended recalls and updates.

So the other day I had the dpf inspection required light come on? So got it booked in to Mazda to get this checked out.

Took a call from the garage to be told that they have tried to a force re generation on it but it cannot be performed ?
From what I’m being told the injectors are faulty, Numerous sensors need changing and that the head  needs de-coking due to carbon build up oh and the dpf is probably blocked. Also forgot to mention the oil level rising. Has anybody else had issues with there car after the engine software update ( AJ024* ) and the Intake shutter valve ( AK016A ) recalls?  Not to sure if any these recalls could have contributed to the failure of these parts as the garage has said that one part failed then in turn has taken out parts there after.

Just one last point, it had its major or what I was told the big service last November.

Clutching at straws I know but just wondering if anybody else has had similar problems and what the out come was as from what I’m being told the cost of the repairs is going to outway the value of the car so I might as well scrap it, certainly not what I expect from a 5 1\2 year car.

Thanks in advance

daveyjp

The Mazda 2.2 diesel of that era is far from their finest hour.

Some would say well done getting 5.5 years out of it, many have expired well before then thanks to oil contamination and rising levels of diesel in the oil due to unfinished DPF regenerations.

A single relatively minor sensor failure on a DPF diesel can lead to much more expensive problems if it goes unnoticed.

rsvtoddy

The Mazda diesel is infamous for this problem. Head over to Honest John forum for advice/assistance but even with a full main dealer history you may not get much/any joy. Your mileage is rather low for a diesel?
Good luck... 

Mercdriver

rsvtoddy said:

The Mazda diesel is infamous for this problem. Head over to Honest John forum for advice/assistance but even with a full main dealer history you may not get much/any joy. Your mileage is rather low for a diesel?
Good luck... 

I wouldn't say that more than 13k a year was rather low.  I'd say that that was around or just above average.

Goudy

These are the joys of modern diesel ownership.
I suspect due to mileage and age your DPF is full of ash.
It's designed to trap soot from the exhaust gases, which are large particles and every so often burn this soot and turn it into ash, which has small particles. They mistakenly call this process "regeneration" but that gives an impression it's renewed, when all that has happened is it's repacking it's content into small particles to make some more space.

Eventually the filter fills with ash and can't perform this repack trick anymore.
The rising oil level is a sign of oil dilution, extra fuel that is added post combustion to find it's way to the filter and cause the burn described above is now  finding it's way into the engine oil as the "regen" process is repeatedly failing.
This is a serious problem as the fuel acts as a solvent in the engine oil, also if it gets too high it can start to throw it out of the sump into the air intake (where the sump breather is plumped into) which can cause the engine to "runaway". It runs uncontrollable on it's own oil until it goes bang. 

Unless they've tested the injectors I presume they are edging their bets as worn injectors will cause a fuel heavy burn which will produce more soot, which will continually effect the process.
But saying that, it's not uncommon for injectors to wear around this sort of mileage, I seem to think these use the 10 hole Denso injectors that can suffer a few problems.
Same goes for the decoke, their plan is to start a fresh with a clean slate.

I guess the Mazda dealer wants a large slice of your earnings to sort this, you might be better to find a diesel specialist that can either clean out or replace your DPF a lot cheaper, test and if needed recondition your injectors and TerraClean your engine, though you don't want to drive it far with the oil in that condition.

arcon5

Sounds like they are replacing everything that could possibly have caused it with no real idea as to what is actually faulty.... take it to a diesel specialist and I suspect they'll do a professional clean of the DPF then do their own regen to complete it if the clean is successful.

Not sure what system yours has but some inject diesel to increase temp inside the dpf. Failed regens then dump it in the oil so that's probably why its rising.

Or even better have the dpf gutted and remapped

Mercdriver

arcon5 said:

Or even better have the dpf gutted and remapped

That's a little bit illegal isn't it?  If it is discovered the car will never pass an MOT until the DPF is back as it should be

bikingbarney

I would take the car for a "spirited" run. 
Down the motorway in 3rd at 70mph for half an hour should get the car doing a regen. Once this is done and the light goes off I would carry out an oil change.

Sounds to me like its had a lot of failed regens in the past.

daveyjp

The logic of 3rd at 70.

higher revs = more fuel burned = more soot generated = regen cycle required = more ash = dpf filling up.

There is no need to run high revs, you just need to ensure the car isn't turned off mid regen.  Unfortunately it went beyond the designers of cars to tell you this was happening and warn you not to switch off.

They probably realised that buyers may get p'd off if just as they end a journey a regen starts and they then have to sit there burning fuel for 10-20 minutes until it finishes the regen cycle.

bikingbarney

daveyjp said:

The logic of 3rd at 70.

higher revs = more fuel burned = more soot generated = regen cycle required = more ash = dpf filling up.

There is no need to run high revs, you just need to ensure the car isn't turned off mid regen.  Unfortunately it went beyond the designers of cars to tell you this was happening and warn you not to switch off.

They probably realised that buyers may get p'd off if just as they end a journey a regen starts and they then have to sit there burning fuel for 10-20 minutes until it finishes the regen cycle.

The logic behind it is higher exhaust temps which will bring on a regen quicker. The issue is that short journeys aren't allowing the car to get up to a temp to allow a regen to take place. 



Worked for my Mazda 6 2.2 when I had issues after doing a bout of short journeys. 

No problems afterwards. 

mrkarlos

Thanks for all the comments, some valuable advice.  Bit of an update, Mazda have inspected this further and it would appear that it does require a carbon clean. But question is what actually caused this? They say that they have to inspect the turbo now as this could be damaged? Why could this be damaged? I’m assuming that it’s all related to the carbon build up just get the feeling that they are wanting to replace everything but key thing is finding the route cause. Just one last question how does the fuel get into the oil for it to rise as I had this rising oil issue for the last 2 services when this was still in warranty.
Thanks in advance