leon fr 2.0 tdi 184 DPF pressure sensor

[dave65]

Hi, my sons car is a leon fr 184 diesel and it's got a problem with burning oil and also a DPF problem, we have been trying a few things to try and get it sorted, the pressure sensor is giving high readings up to 1000 hpa when under load thought it might be a faulty sensor so it,s been swapped for the one on my car a B8 Passat.
what i have noticed is that my Passat has 2 pressure sensors with one pipe coming from each but on his it only has one sensor and only one pipe coming from it which doesn't look right, does anyone know if this is correct i can't find any information anywhere.

 

[BillyCool]

If you mean the DPF sensor, then yes, it only has one pipe and the other has no connection. My 184 is the same and I initially thought is was wrong. Finally found some info somewhere that it's quite normal.

If the car is burning oil the DPF will be catching a lot of it and that won't help. Could be the DPF is getting bunged up. Do you have a OBD reader? I have a Carista dongle and use VAG DPF app to look at my DPF stats.

1000hpa is off the chart, so something isn't right. The sensors can get mucky over time and give false readings. Also worth removing the single pipe and making sure it's not blocked or restricted.

Questions:

• What mileage is the car?
• Any idea how much ash is in the DPF?
• How often does it regen?
• How do you know it is burning oil or is it just using a lot? (the car has a habit of losing oil via other methods)
• What is the hpa at idle and pre/post regen?

Could be 2 separate issues or they are related. Hard to say.

 

[dave65]

The car has done 140k and the oil usage has been getting worse over the last year now using about 500/750 ml over about 250 miles it does have a bit of a leak but suspect it’s burning most of it , no smell of oil tail pipes are clean and has just past mot no problem.
Ash is on 57% and it’s doing a regen about every 30 miles
Hpa at idle is 170 and rises to about 1000 when under load.
Car has also been getting low boost code P0299 which I have been told could be down to the pressure in the DPF
I do have vag DPF I’ve included the screen shot of the last regen, have just noticed the soot measured vs calculated is wildly different.

 

[SuperV8]

Hi, my sons car is a leon fr 184 diesel and it's got a problem with burning oil and also a DPF problem, we have been trying a few things to try and get it sorted, the pressure sensor is giving high readings up to 1000 hpa when under load thought it might be a faulty sensor so it,s been swapped for the one on my car a B8 Passat.
what i have noticed is that my Passat has 2 pressure sensors with one pipe coming from each but on his it only has one sensor and only one pipe coming from it which doesn't look right, does anyone know if this is correct i can't find any information anywhere.

I think that will be down to the different Euro emissions versions.
Guessing your sons is CUPA which is Euro 5 and the Passat is Euro 6?

 

[R3k1355]

Replace the DPF pressure sensor with one of the same part number, it's written on the original sensor. You shouldn't be swapping parts over if you aren't certain they are compatible.

If you're burning oil you're filling the DPF up with crap, you don't get that fixed you might well knacker the DPF big time.
Sort the oil issue and see if you can save the DPF with a clean.

 

[dave65]

The DPF sensor has been swapped out for the one off my car, its exactly the same part number and is giving the same readings, the Leon sensor is now on my car and is reading normal so its not a sensor problem.

 

[SuperV8]

I would have a look inside your intake hoses - to see if there is any oil from a leaking Turbo?

 

[dave65]

Good shout will have a look at the weekend

 

[BillyCool]

The car has done 140k and the oil usage has been getting worse over the last year now using about 500/750 ml over about 250 miles it does have a bit of a leak but suspect it’s burning most of it , no smell of oil tail pipes are clean and has just past mot no problem.
Ash is on 57% and it’s doing a regen about every 30 miles
Hpa at idle is 170 and rises to about 1000 when under load.
Car has also been getting low boost code P0299 which I have been told could be down to the pressure in the DPF
I do have vag DPF I’ve included the screen shot of the last regen, have just noticed the soot measured vs calculated is wildly different.

Mine is on 154,000 and on 61g of oil ash residue. On the face of it, your numbers are not that bad.
The engine is prone to oil leaks, from both the plastic cam cover and the plastic oil cooler. I thought mine was using more oil than it was until both of those got sorted. If it's not that, then it's using it another way.
Regen every 30 miles isn't great.
hpa at idle could/should be around 20 to 40. Yours is very high. If thats an accurate figure then the DPF is properly clogged and also explains why it wants to regen so often.
The boost fault code could be several things but also a sign that the turbo is on the way out (check pipework as suggested above)
The soot measured and calculated figures being so far off could be an issue. What does it say directly after a regen?

It sounds more like an oil leak and DPF getting messed up by it rather than a faulty sensor. The boost code could mean a turbo fault, leaking seal, extra oil where you don't want it. I think as suggested by @SuperV8 that would be a good place to start.