Hi guys (and girls)

 

Newbie here, so go easy..

 

Just joined the club by purchasing a 2017 Superb Mk III at a good price, high mileage (250k plus miles) being the sobering element of the decision concerned.

 

Car drives very well, but throws a fault code for the differential pressure sensor on the DPF, it's generated without fail upon each key ignition cycle (been investigating using my VAG-COM) even when cleared..Engine Light comes on from 20 miles onwards (it's related I'm assuming).

 

No DPF dash icon (yet) so am hoping it's a bogey sensor only with a recent TB change..the soot readings of -12g measured vs 13g measured are what caught my eye (see picture of VCDS fault code) as being a little bit strange.

 

Before I send her into the local 'stealership' for further investigation I'm wondering have any of you scholars on here experience a similar fault code and if the reported masses are anything near expected for a clogged DPF (20g plus would be the norm I'm assuming).

 

Thank you all in advance, here hoping you might save a man a few quid and make me feel less of an idiot for having purchased a very expensive lemon most likely.

 

Best regards

 

Jonny ;-)

What is the figure for the DPS adaption value? It is off the edge of the photo.

 

A minus measured figure indicates that the offset adaption routine needs running or the sensor is faulty, I believe the former.

 

What is the calculated oil ash mass or volume? That will be more revealing.

Edited 19 May, 20233 yr by J.R.

J.R.

 

Many thanks for this, picture attached below with DPS adaptation value as requested.

 

Bizarrely the code has since vanished and has not been reproduced upon key ignition cycle...but it will most likely re-surface when I take her out for a spin later.

 

As regards the Offset Adaptation Routine could you kindly further advise re: the procedure? I'm running a very old version of VAGcom VCDS (due to be shortly upgraded) and the interface under the Engine Module is as per picture with some RB options greyed out.. Hopefully there's an alternative workaround for the CAN version I have.

 

Many thanks again for the initial steer in any event.

 

Jonny

The adaption routine should be found under the "Adaptation" tab.

 

VCDS or perhaps its VAG behind it is absolutely terrible regarding units and positive/negative, it would not surprise me in the slightest that the negative value should actually be a positive one.

 

The best thing you can do is go into "Measuring blocks" and read the output figure for the DPS in whatever units they chose to use in their drunken state, probably light years! Check it at tickover and then at 2.5K RPM it should go from a low to a higher figure, no point me stating what mine is as its probably different units, once you have the figures and units of measure  then you can Google to see if they are reasonable or not.

Gent. Cheers. 🙏

Also have look here, if you didn’t already:

18884/P2452/009298 - Diesel Particle Filter Differential Pressure Sensor: Elect. Malfunction

 

Many thanks mate. Will do that and have a look at the sensor to see where it is at physically (esp. given the TB was changed recently). 🙏🙏🤞