Hello all, hope someone can help with this issue?

Story as follows, had a copper washer disintegrate which was the start, so I removed all injectors cleaned with new washers and replaced 1 on cylinder 5. After coding it in and test drive(runs sweet btw) the coil light was flashing, so plugged in vcds to get the dreaded p200200 code! Called a dpf specialist to have a look which was just informed that the dpf is no where near blocked and he suspects a low egr pressure issue! Now do I clean it or replace it? Not afraid of getting involved in the engine as im changing cooling fans as a module on fan 2 is kaput so changing the lot and did the injectors myself as well as brakes and such like. Not sure where to go from here so just looking for advice/thoughts on possible solutions. Thank you all in advance

What's the current mileage and is this car doing short journeys at all?

If you can do the work yourself, then that's half the battle. So this is one of a number off issues with Volkswagen Audi Group (VAG) diesels and Euro 6 engines, namely gummed up EGR valves, DPF and hopefully not AdBlue which is also known to fail. If you've already called a DPF specialist and they have confirmed soot levels aren't enough for DPF to regenerate, then it does point back to the EGR.

If you can do the work yourself - that will certainly help. Search on LLL Parts for diagrams particular to your A6 engine code.

In addition - look at videos from Dave Sterl related to P0403 fault on an A4 and O'Rileys Autos with P200200 fault, on a Q5 2.0 TDI.

So what can you do? Short term you might be able to dismantle and clean the EGR valve, then run a can of Forte diesel conditioner through it on less than a quarter tank, drive it hard then replace the fuel filter. Should be done every 20k miles. I'd also run premium diesel.

2 hours ago, spartacus 68 said:

What's the current mileage and is this car doing short journeys at all?

If you can do the work yourself, then that's half the battle. So this is one of a number off issues with Volkswagen Audi Group (VAG) diesels and Euro 6 engines, namely gummed up EGR valves, DPF and hopefully not AdBlue which is also known to fail. If you've already called a DPF specialist and they have confirmed soot levels aren't enough for DPF to regenerate, then it does point back to the EGR.

If you can do the work yourself - that will certainly help. Search on LLL Parts for diagrams particular to your A6 engine code.

In addition - look at videos from Dave Sterl related to P0403 fault on an A4 and O'Rileys Autos with P200200 fault, on a Q5 2.0 TDI.

So what can you do? Short term you might be able to dismantle and clean the EGR valve, then run a can of Forte diesel conditioner through it on less than a quarter tank, drive it hard then replace the fuel filter. Should be done every 20k miles. I'd also run premium diesel.

Hi Spartans 68, its an a6 avant 3.0 bitdi 2013 with 115000 miles so thankfully no adblue. Also forgot to mention that the module for cooling fan 2 is not working so I have a new one. When I tried to force regen, pre these checks it said 'failed for safety reasons', what ever that means. So while im in there ill probably remove and clean the egr and see where that takes me. I only run premium fuel out of good practice.Just annoying that it comes all at once, but it is what it is. I'll have alook for those videos, thank you.

Ok, so Euro 5.

Not having AdBlue is probably a bit a bit of a blessing. I’m assuming the DPF regen was aborted due to the cooling fan error. Get that fixed, clean the EGR, run some Forte through it and wait for the DPF regen, rather than forcing it.

You’ll probably need to remove the bumper to access the fan. Hidden bolts under the wheel arch liner.