Thread: DPF??

Originally Posted by gavinwibrow

I think what he means is what am I looking for?

While I haven't seen the D3/4 DPF setup, if you Google Image search pictures of 'diesel particulate filter' you should be able to get a rough idea of what they look like from them. Almost a larger more complicated cat converter which might have some tubes or lines connecting to it. Then stick your head under the vehicle and see if it's there in your D3/4's exhaust system.
Again, no expert here, but I'd image the cat converter is there too - either before or after it - so if you can identify the cat converter and another similar looking item then you probably have a DFP.

Might be handy if anyone on here has a DPF vehicle if they can post up a picture or two of it in the exhaust system that others can use as a reference.

Alternatively, if people are wondering, put your vehicle into Off Road Height mode, get under and take a picture and someone on here will likely be willing to have a look and confirm for you.

Originally Posted by Graeme

The catalytic converter will always be before the DPF because for a DPF regen the engine is purposefully over-fuelled to cause the cat to generate sufficient heat to burn off the particulates in the DPF.

Indeed. The DPF is pretty obvious. It sits under the passenger seat, has pressure sample pipes pre and post, and a temp sensor at the exit. DPF equipped cars also have a post-catalyst temp sensor before the DPF. It is fitted with a slip joint on the front and a triangle flange between the DPF and front muffler.

This is what it looks like from above (with the flange cut off anyway). The pressure sensor lives up in the transmission tunnel. It's a a complete bastard and getting it cut out was incredibly satisfying.


Having said that, the DPF does have some massive pluses when it comes to "rotten egg smell on startup" and mitigating that blast "cloud of smoke" when you scream off from the lights. The intermittent "drop to the stops, limp mode *on*" faults made it more than I could bear however.

Apparently they are some $2.5k to replace, so I'm sitting on my re-tyre-ment there.