Mazda 6 2.2d Sport 2014 Low Oil Pressure Issue

LiamChappell said:

Firstly I'm not a qualified mechanic by any stretch I'm just going by what I've read online and with basic knowledge of cars.

So I've got a 2014 mazda 6 2.2d sport grand tourer which I bought from a trader in july, worked absolutely fine up until around a month ago when it started to show the 'low oil pressure, engine damage possible, check oil level' red triangle warning light on the cluster display along with engine management light. At first I thought this was just a sensor issue as I took it to a garage and the oil was below the X marker. He recommended I just drained the oil and changed the filter and oil so I did that and it went off.

For a few weeks. The oil level rose again and this time the oil change due notification come along with the engine management light but no oil pressure light. I then figured out this only happened when the fuel level was below about an 8th of a tank. Once filled back up the warning light would go out and business as usual.

I was getting a bit concerned as this shouldnt be happening so I did a bit of reading online and I read it could be a DPF issue with the oil level rising diesel could be going down into the oil from the injectors spraying extra diesel into the combustion chamber to burn off the excess soot that had accumulated. Thus thinning the oil out and triggering the low oil pressure warning. This made perfect sense as I do a lot of short journey driving in my job, rarely giving the exhaust time to properly regen, plus my fuel economy had dropped down to about 28mpg from the 45mpg I was getting before. So I did a forced regen on it and drove up and down the M1 at about 3000rpm for an hour and this kicked out a lot of smoke after about 20 mins so I was getting my Hopes up.

It seemed to have fixed the issue of fuel economy and the drive felt a hell of a lot smoother so I was really happy. So all that needed to be done was to change the oil again as it had been diluted with diesel and raised above its recommended level.

I did this a couple of nights ago, The oil did smell like diesel and when I took the filter off no excess oil come out after unscrewing which seemed a bit odd as it has every other time I've changed the oil. When refilled and put back together the issue just got worse, it instantly went into limp mode every time I turned the engine on and this time spat out two fault codes:

P0524 - engine oil pressure too low
P055F - engine oil pressure out of range

I cleared the codes using the obd reader I have and it just instantly put them back up. Restarting the engine didnt clear it either. I drove it back home to my house around 2 miles away and the engine sounded extremely loud on tick over like it has no oil running through it at all and is very dry. Almost like a quieter tractor. So my suspicions are pointing towards the oil pump but I dont know if it's the pump or a clogged strainer or another fault because its just beyond my knowledge.

Has anyone else seen or had this fault and can you please help as Mazda are obviously as expected saying it could be upwards of 3k to get this fixed from what I've told them but i want to know if anyone knows exactly what the problem could be so I can just buy the exact bits and replace them instead of buying loads of parts it doesnt need.

Any help at all would be greatly appreciated!! Really dont want to lose this car as I love it and never had problems with Mazda until now (4th mazda car)

Thanks in advance

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LiamChappell said:

Firstly I'm not a qualified mechanic by any stretch I'm just going by what I've read online and with basic knowledge of cars.

So I've got a 2014 mazda 6 2.2d sport grand tourer which I bought from a trader in july, worked absolutely fine up until around a month ago when it started to show the 'low oil pressure, engine damage possible, check oil level' red triangle warning light on the cluster display along with engine management light. At first I thought this was just a sensor issue as I took it to a garage and the oil was below the X marker. He recommended I just drained the oil and changed the filter and oil so I did that and it went off.

For a few weeks. The oil level rose again and this time the oil change due notification come along with the engine management light but no oil pressure light. I then figured out this only happened when the fuel level was below about an 8th of a tank. Once filled back up the warning light would go out and business as usual.

I was getting a bit concerned as this shouldnt be happening so I did a bit of reading online and I read it could be a DPF issue with the oil level rising diesel could be going down into the oil from the injectors spraying extra diesel into the combustion chamber to burn off the excess soot that had accumulated. Thus thinning the oil out and triggering the low oil pressure warning. This made perfect sense as I do a lot of short journey driving in my job, rarely giving the exhaust time to properly regen, plus my fuel economy had dropped down to about 28mpg from the 45mpg I was getting before. So I did a forced regen on it and drove up and down the M1 at about 3000rpm for an hour and this kicked out a lot of smoke after about 20 mins so I was getting my Hopes up.

It seemed to have fixed the issue of fuel economy and the drive felt a hell of a lot smoother so I was really happy. So all that needed to be done was to change the oil again as it had been diluted with diesel and raised above its recommended level.

I did this a couple of nights ago, The oil did smell like diesel and when I took the filter off no excess oil come out after unscrewing which seemed a bit odd as it has every other time I've changed the oil. When refilled and put back together the issue just got worse, it instantly went into limp mode every time I turned the engine on and this time spat out two fault codes:

P0524 - engine oil pressure too low
P055F - engine oil pressure out of range

I cleared the codes using the obd reader I have and it just instantly put them back up. Restarting the engine didnt clear it either. I drove it back home to my house around 2 miles away and the engine sounded extremely loud on tick over like it has no oil running through it at all and is very dry. Almost like a quieter tractor. So my suspicions are pointing towards the oil pump but I dont know if it's the pump or a clogged strainer or another fault because its just beyond my knowledge.

Has anyone else seen or had this fault and can you please help as Mazda are obviously as expected saying it could be upwards of 3k to get this fixed from what I've told them but i want to know if anyone knows exactly what the problem could be so I can just buy the exact bits and replace them instead of buying loads of parts it doesnt need.

Any help at all would be greatly appreciated!! Really dont want to lose this car as I love it and never had problems with Mazda until now (4th mazda car)

Thanks in advance

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Mazda_sometimes_sucks said:

I got both (+ various other) on my 2013 model ...

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Mazda_sometimes_sucks said:

Well, the "funny" username comes from the various issues I had with that car, notably the one that nearly destroyed the engine ...

I still have the car, although it is once more in the garage, my dealer found the diesel injectors are dead.
The car is now 7 years old and reached 270'000km. Fixing the injectors will cost me 3000 Euros so I'm not sure I'll do it.

Regarding the list of issues, I already posted it onto another thread but, as I've seen I forgot some of them, here is an updated list:

• Twice the front radar failing
• Twice the rear camera failing
• Fuel inlet obstructed, needed assistance
• Oil pump replaced
• Several "low oil pressure", one of them, just a couple of months outside warranty, required the replacement of:
  • camshafts + rockers + cover replacement
  • complete turbo replacement (the axis twisted due to bad lubrication)
  • rod shells replacement
  • injectors joints replacement
  • oil pump strainer replacement
  • complete cleaning of the engine with engine oil and filter replacement, gearbox oil replacement, ...
  • normal cost would have been over 10k Euros, I finally paid around 5K Euros
• Gearbox oil pump replaced
• Wheel bearing replaced
• Rear-door damper replacement (campaign)
• Engine oil leak
• Hand-brake check (campaign)
• Rear brake calipers replaced (campaign)
• Alternator belt broken, required assistance (foreign country) and lost 4 days in the country before it was locally fixed
• i-Stop in error, battery changed
• i-Stop in error, engine oil overheat (not sure of the link but this is what I've been told)
• Front suspension ball joint broken, suspension arm damaged
• Coolant pipe cracked during the Covid period and dealer was closed: I was permanently driving with 10 liters of water in the trunk
• Oil pump chain broken
• Diesel injectors to be replaced, engine just stopped, required assistance (foreign country)

Yes, not bad at all ...
That said it's a great car and engine ... when they work.
I'm just afraid Mazda is shooting in its own feet by continuing to sell that engine, it has major flaws.

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pashe said:

Low oil pressure warning can also happen when your oil is diluted too much. Oil is just so thin that oil pump can't rise pressure high enough.

I had this issue this week and here is what happened. First I got yellow text "oil change needed" and I had driven only about 12000km with that oil. After that I continued driving as usually I change oil just in every 15000km. When driven about 13000km, I had red warning for low oil pressure. I stopped and checked oil pressure with my ELM adapter and it was about 20psi for idle and about 30-35psi when driving. Normal pressure should be about 25psi for idle and 50psi when accelerating.

As there were quite enough oil pressure, I decided to drive home about 40km. I measured oil pressure and oil temperature all the time when driving home.

At home I changed oil and cleared oil dilution values and trouble codes. Oil pressure trouble code couldn't be cleared by Forscan, but I had to use another app for that.

After oil change the oil pressure was again normal 25psi and 50psi.

My car had recall for software update by Mazda this spring and I am quite sure that they have changed values for oil pressure warning limits in this new software as this issue came up after thatand with relatively fresh oil.

So, when you will have yellow text recommending oil change, you should believe it and do it.

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