Multiecuscan

I have this error repeating on my 2007 1.9JTD. Having just repplaced the DPF am wondering if sensor faulty or blockage further down the exhaust, etc. What exactly triggers this Engine Management Fault? Does the Differential pressure need to reach a certain value? Can't seem to see what is actually causing this. Can anyone help!.

When you replaced the DPF did you in MultiECUScan intiate/operate the DPF replacement function?

If not then please try this.

Yep. Did the DPF changed actuation. Drove @100 miles then have this recurring P1206 Clean or Replace Particle Filter flag coming up and putting car into limp mode. Tried a manual regeneration last night but it failed ... multiecuscan stopped it and flagged up 'Injector Setting out of permitted range' .... now wondering if I have an injector problem at the back of all this trouble? But don't know what to look out for. Injector 1 readings look different on a multiecuscan chart of the engine running.

I'll hold my hand high here and say that I'm beginning to get out of my depth and experience here.

However I'll throw some comments in to a) attract others to the tread and b) possibly spark some thought/research at your end.

Why did you replace the original DPF? What were the circumstances that led to you replacing the DPF? Did you reset the error code after/before fitting the new DPF?

On DPF systems they use either "differential" or "absolute / relative to atmospheric" pressure readings. I don'y know which system your Multipla uses but you can find this out for yourself by examining the DPF filter and how many pressure feeds come off the DPF.

From your original post it seems clear that the ECU is reading a high pressure but this assumes that the presure sensor is reading correctly?

If you have a true differential system then it may be possible that the pressure pipe from the rear of the DPF has a bad seal, holes, or has come disconnected from the pressure sensor. A test for this would be to get under the car, disconnect the tube, suck on it and seal with your tonge. Should stay connected to your tonge for a good few seconds. You can also monitor the MultiECUScan live data for sensor pressure. Then you can block the exhaust pipe and see what changes. Hopefully these sorts of tests will give a decent clue as to what is going on.

Regarding injectors then it could be that you have a leaky injector which results in execessive fueling and soot production. I think that for this to be a problem the soot production would have to exceed the DPF regen cycle's ability to clean the DPF or otherwise interfere with it.

Have a look in MultiECUScan at the DPF stats (last regen distance, temp, and time, etc.)

Another factor to look at is the "Oil Degradation" and "Oil Change Reset" counter. If the oil (in the ECUs opinion) is too old to support a regen cycle then no regens will take place and the DPF will eventually clog up. On Fiat cars fitted with DPFs the Service Counters and Oil Change Counters are separate and independent functions.

I'm running out of "thoughts" now (getting hungry and time for food) but I hope the above may shed a little further light & investigation & with a little bit of luck awake somebody who has experienced the same problems as you.