[mart4856]

Hello, Just want to share my story if someone could find it useful. I have 2014 Mazda 6 driven now about 416 000 km and those kilometres driven mostly by me, so I have owned this car already for years and so quite familiar with it. The car has original DPF and never done anything (wash or clean or else) to it. Usually my interval between regens was between 240-400km, but about six months ago, it suddenly went to around 160km. I read this topic and decided to try replace the exhaust gas pressure sensor and so bought the latest improved version of that and replaced it by myself. (Same time I replaced vacuum pump as error code for it came 5 times within couple weeks, but this shouldn't have any effect on regen intervals.) I didn't reset any learned values of the gas pressure sensor after replacement. First I thought it wasn't helpful as didn't see any significant effect on regen intervals, but now after about 5 or more regens, the inteval has improved every time. Last one I had today was 330km and before that it was 300km so it seems it's getting better cycle after cycle. So, my point is that this sensor can be one reason for too short regen interval, but of course it can be something else as well.

Wow that's some massive mileage. If it's not a typo that's 260,000 miles in 8 years! Are you still on your original injectors? Have you had the EGR, cooler or inlet manifold cleaned? Are you still on your original cam chain? If so that's pretty amazing!

 

[Pashe]

Wow that's some massive mileage. If it's not a typo that's 260,000 miles in 8 years! Are you still on your original injectors? Have you had the EGR, cooler or inlet manifold cleaned? Are you still on your original cam chain? If so that's pretty amazing!

Had to check the service history of the car to reply to your questions more precisely and same time checked the mileage. I didn´t remember it correctly, it wasn't 416000km but it was about 413000km.

Injectors and cam chain are original and can't say for sure if some parts of the engine have been cleaned or not. This is because the engine has been opened twice, but I haven't seen any report on any cleaning they would have done same time. Hopefully this would be something they would do in the service automatically when they have a chance to do it.

First time the engine was opened @236000km, when the oil sump was clogged (I have written about this issue to one Mazda forum). Then they opened the engine to see if bad oil circulation would have cause any damage to the engine, but they didn't find any damage. They did burn/clean the soot from the injectors and replaced the oil strainer (SH01-14-240) and injector washers (4 pcs of SH01-13-H51).

Second time was @329000km when I noticed the the engine is loosing some coolant. It came out that the head gasket is leaking and had to be repaired. When they opened the engine, they noticed that camsaft had worn (known issue with this engine) and has to be replaced. They replaced the camsaft, 16 pcs of valve lifters, water pump and 4pcs of rocker arm lifters, but not for example cam chain.

What else has been done under the hood is that overrunning clutch of the alternator has been replaced and the PCM (SH1S-18-881V) has been replaced. Nothing more beside the normal service operations.

 

[mart4856]

What would happen if you either disconnect both rubber hoses to the differential pressure sensor or just the electrical connector?

Would this stop the sensor starting a DPF regen or would try and do one all the time? I suspect it would throw a DTC and warning light.

If it worked then the DPF regen would only be triggered after each time 17.1 litres of fuel have been consumed.

 

[gk66]

What would happen if you either disconnect both rubber hoses to the differential pressure sensor or just the electrical connector?

Would this stop the sensor starting a DPF regen or would try and do one all the time? I suspect it would throw a DTC and warning light.

If it worked then the DPF regen would only be triggered after each time 17.1 litres of fuel have been consumed.

You'd get a DTC and check engine light.

 

[Village]

Hi Everyone, I am having the exact same problem with my 2017 Mazda 3, 1.5. Did replacement fuel injectors sort this long term for those who took that route?
Long backstory of rising oil levels, excessive black exhaust smoke (caused by rising oil levels), a new DPF fitted that pretty much immediately blocks again followed by limp mode, TPMS & traction lights ultimately ending now with the car not starting.

 

[mart4856]

Hi Everyone, I am having the exact same problem with my 2017 Mazda 3, 1.5. Did replacement fuel injectors sort this long term for those who took that route?
Long backstory of rising oil levels, excessive black exhaust smoke (caused by rising oil levels), a new DPF fitted that pretty much immediately blocks again followed by limp mode, TPMS & traction lights ultimately ending now with the car not starting.

How many thousand miles or kilometres has your car done and what is the car mainly used for (short, long journeys or a mix?).

4 injector fitted and coded at a Mazda dealer costs 2000 Euros +. You can buy cheaper unknown quality ones on eBay but these will still need testing and coding.

Was your DPF terminally blocked and if so at what distance? Could it not have been cleaned? Are you using Forscan or another program to monitor the build up of particulate matter and distance between DPF regens.

It might be worth trying to find a diesel injector specialist to test your old injectors spray patterns and check for cavitation!

 

[Village]

The DPF that was removed had a hole in it & was beyond repair. Car has 110km & used for mixed driving. New DPF is pretty much immediately clogging leading me to believe it’s an underlying issue & not the filter itself. I’ll check out diesel injector specialists, hasn’t thought of that, thanks!

 

[mart4856]

The DPF that was removed had a hole in it & was beyond repair. Car has 110km & used for mixed driving. New DPF is pretty much immediately clogging leading me to believe it’s an underlying issue & not the filter itself. I’ll check out diesel injector specialists, hasn’t thought of that, thanks!

Sounds like it is over fuelling. Is fuel consumption bad? Only other thing I can think of is a dirty or faulty O2/Lamba sensor which cause the injectors to add extra fuel. I think this would cause an engine warning light.
I would like to inspect and clean my upstream 02 sensor but don't know where to find it.

 

[blippybay]

I've recently bought a late 2015 Mazda 6 2.2d Skyactiv. The car has 79k miles on with good service history. At 60k it had a new Turbo and at 64k it had a full carbon clean at the main dealers

So far I've done about 600 miles in it, a mix of motorway and town driving.

Today I assume it did a regen, istop to not ready and halo around the engine symbol not lit. However during the regen the car ran very badly, really down on power (wouldn't accelerate over 70mph) and was like it was misfiring, you could feel the engine stuttering under any real load, partial throttle with no load it was OK, and revved fine stationary. After 15 mins of driving, the istop went back to ready and the halo reappeared around the engine symbol car seemed to run fine again.

Is this normal when regenerating the DPF, or is it a sign of another issue? I've had Diesel VW and Audis before this, of a similar age and newer, I'd never even notice they were doing regens. And if it is normal, I'm not sure I can stand it doing this every fee hundred miles, it was awful to drive for those 15mins or so.

 

[rrbotten]

I had a similar problem with my 2015 1.5D - same solution offered by Mazda new injectors. Solved by a local garage who put a meter on the exhaust pressure sensor, which was wildly fluctuating in its readings. The senor and the pipe it was attached too had become blocked up with soot. The ECU did not know what to do with the fluctuating readings so put the DPF light into flashing mode. They cleaned up the pipe and the sensor and then the system went back to normal. It reoccurs every six months or so, I then just clean the sensor and blow through the pipe and it is fine again. I suspect there is an underlying problem sooting up the pipe which is what I will try to figure out next.

 

[Alaraak]

I had a similar problem with my 2015 1.5D - same solution offered by Mazda new injectors. Solved by a local garage who put a meter on the exhaust pressure sensor, which was wildly fluctuating in its readings. The senor and the pipe it was attached too had become blocked up with soot. The ECU did not know what to do with the fluctuating readings so put the DPF light into flashing mode. They cleaned up the pipe and the sensor and then the system went back to normal. It reoccurs every six months or so, I then just clean the sensor and blow through the pipe and it is fine again. I suspect there is an underlying problem sooting up the pipe which is what I will try to figure out next.

hi, i have the cars as you and same probleme, can you tell me slt, Where
here is the dpf sensor on this car?

 

[jamazda3]

I had a similar problem with my 2015 1.5D - same solution offered by Mazda new injectors. Solved by a local garage who put a meter on the exhaust pressure sensor, which was wildly fluctuating in its readings. The senor and the pipe it was attached too had become blocked up with soot. The ECU did not know what to do with the fluctuating readings so put the DPF light into flashing mode. They cleaned up the pipe and the sensor and then the system went back to normal. It reoccurs every six months or so, I then just clean the sensor and blow through the pipe and it is fine again. I suspect there is an underlying problem sooting up the pipe which is what I will try to figure out next.

To clarify, you were getting frequent regenerations that could be temporarily fixed by clearing out the pipe and sensor? Something to check out on my 1.5D.

 

[rrbotten]

To clarify, you were getting frequent regenerations that could be temporarily fixed by clearing out the pipe and sensor? Something to check out on my 1.5D.

I couldn't tell you about the number of regens as I have no way of finding out how many have occurred. But if I get a flashing DPF light cleaning this sensor removes this fault. Before it was cleaned the DPF kept building up until the ECU slowed the engine before finally cutting it off. So it sounds like it prevents regens rather than causes them to occur.

It is the item circled on the picture attached. I am away this weekend so cannot take a photo of the sensor in the engine bay but it is near back of the engine bay above the DPF and catalyst roughly in the middle, secured with two bolts and a spring clip on the hose. It takes a less than five minutes to clean it.

 

[Aji123]

The differential pressure sensor is what triggers the Regen, it doesnot measure velocity of the gas but the pressure as you rightly said earlier in your explanation. This is the sensor which measures the dp. If you have too many regens you get P243C.00.2F code come up. The sensor islocated to he left of the engine up against the firewall bolted to a bracket, rubber tubes connect between the sensor and steel tubes coming offthe DPF. There is another exhaust sensor that actually measures the pressure of the exhaust. With the aid of Forscan and a OBD reader you can see the readings from these sensors, including various exhaust temperatures in the system, plus the number of miles/km since the last regen. You can sometimes miss on the instaneous fuel consumption if its hilly.

Hi is it possible to clean this sensor?

Thanks

 

[Aji123]

Is it possible to code new injectors using forscan?

 

[jamazda3]

Yes, I believe so

 

[Alaraak]

hi, somebody can take a picture of this sensor?

 

[jamazda3]

hi, somebody can take a picture of this sensor?

I'm assuming you're trying to locate it - for the 1.5 it's known as the 'Exhaust gas pressure sensor No. 2' and is positioned on the side of the engine just above the auxilliary belt tensioner.

See here https://mazdamanuals.com.au/wsm-secure/WSM/D9G6-1A-21B_Ver17/esicont/srvc/html/id0140q2443600.html for the relevant part of the service manual

 

[Connie04]

Hy everyone! I have a 1.5 d 2017 and I m tired of that DPF yellow light that keeps happening. And after all is increasing my oil , after 1000 km I have again “ Engine oil level high”. Do you know if there were some factory recalls for this model?

 

[Jpk]

The oil shouldn't really rise much unless you're turning the engine off before it's finished doing the regen. If you're allowing it to finish then failing injector seal washers can be a common cause, there's no recall for them, however Mazda realised the original spec washers weren't good enough and they've been updated along with the installation process