Hi all I bought a 2.0 mk3 vrs dsg vrs and discovered it was loosing water .the garage took it back and took it to main dealer who could not find anything wrong .the place where I bought it done further tests and said it was the egr cooler / heat exchanger and said he replaced it .now got the car back and the eml light on and the coil light flashing put it on vcds and 2 faults showing saying particulate filter partially blocked and number 1 bank sensor. Also went to do a test on egr and this is showing up .it seems to me it has been bypassed  any ideas

I would check to see when your car last did a regeneration. It should say distance since last done. 

Also I would adapt the egr valve to reset it. Very easily done on these cars as you don't have to enter predefined numbers. Just find it in the engine control unit and click adapt. 

With the calculated soot level you will need to either do a service regeneration if the numbers don't come down after normal driving.  Or have the dpf cleaned. The figures are only estimated and chances are the dpf is more blocked than what the numbers are. You can buy dpf cleaner which reduces the temp of the dpf when running and allows a passive regen. When blocked the dpf gets super hot and safety programmes kick in to prevent a fire so it stops a regen.

The "actual" figure is showing the DPF a flowing freely, too freely as its a negative number, the DPF pressure sensor needs to be calibrated using the procedure in Adaptation I think it is, it will create an offset figure so with the engine not running the pressure shown is the same as atmospheric pressure.

 

A regen however should have been initiated when the calculated value reached 25g or whatever the threshold is for your vehicle so there is another problem somewhere, once it goes over 50 I think its game over.

 

I have an EGR emulator and the actual soot values are a quarter of the calculated ones.

Hi the car was running when I took these photos