skoman

It may also be worth getting someone with VCDS and looking at the measuring blocks for the injectors and fuel system in general and try to pinpoint what is happening regarding fuel delivery under load. It could be a leaky injector which could be dumping fuel causing low fuel pressure.

Are you able to look up the Differential pressure sensor readings? With the ignition on but engine off the reading should be zero and when the engine is running you should see it start to climb.

Yes I believe you can. Make sure you have at least 1/4 tank of fuel & Handbrake is ON Start engine & plug in the OBD eleven- do a scan and clear any engine error codes In '01 Engine' select 'Change Service' and then select 'EOL' (end of assembly line) mode Login using code: 27971 In 'Basic settings' scroll down & select 'Service regeneration of particulate filter' Press the green button for several seconds- ignore red error message Switch off engine- but leave key in & ignition ON Restart engine and go back to 'Change Service' and select 'EOL'- using same code In Basic settings scroll back down to 'Service regeneration of particulate filter' Press green button again for a few seconds- which may turn from green to grey- ignore red error message then Firmly press brake pedal for a couple of seconds and then let go & gently press the accelerator pedal and the revs should gradually climb on their own to 2000 rpm. The OBD will now have a red STOP icon on your screen- you can press this if you need to abort the process at any time as it takes a while.. Now simply leave the engine for as long as it is revving it will drop to 1100 rpm after a period of time- but continue to leave it at 1100 rpm for another 10 mins or so, or until the revs drop to normal 600 rpm and the Red STOP icon is no longer showiing. Finally, Run a new error scan and clear any new fault codes. Let me know how you get on

That code refers to the DPF unable to complete a full regeneration. It could be a faulty pressure sensor or associated wiring or it could be a blocked DPF. You could first try a forced regeneration of the DPF it may or may not work.

If you mean the Current supply relay (J329) if memory serves me correct that is under the dash in position 9. If you pm me your Car details I can double-check.