23-10-2014, 06:08 AM
To check the state of your DPF you really just need to be doing a physical back pressure check using a manometer. You can just remove your lambda before the filter and check what pressure you have. On tick over you should have almost no pressure at all, then as you approach WOT you should see no more than 3 bar max, any more than that and your filter is blocked. I bloke I worked with had an Audi with this problem and he poured neat adblue into the DPF then went on road test lol he said it was smoking like a twat and was DOP but then there was an almighty bang and the engine came alive. If you can't check the back pressure at the lambda you can check the pressure at the differential pressure sensor, but for that you will need a gauge that shows positive and negative pressures