MartinCB

Hello! I am cross posting this from another VAG forum since no one seemed to know there

So we have had our Audi A6 2.7TDI -07 for almost half a year now. Recently one of Sweden's largest tuning companies (BSR) had a sale where all tunes got 25% off so we decided to tune our 180 HP to a 240 HP car. However after applying the tune the MIL came on and the glow plug light starts flashing if you rev it over 2500 r/min, with the flashing glow plug light the car goes in to Limp mode which goes away if you turn it off and on. I am not 100% sure but probably the fault did not occur because of the tune, something was probably on the verge of breaking and with a little extra power it gave up. That leads me to my question about what is broken?

I did some research about the fault code and a lot of people have hade problems with clogged up EGR valve and/or EGR cooler. So I got to it and took it all apart and cleaned everything + lubricated up the EGR valve. However all of the piping + the EGR valve were very clean compared to the pictures I have seen online, they only had a thin layer of soot but absolutely no blockage. So not to my surprise the fault code was still there when I reassembled everything.
(Also when we had the EGR valve out we tested it with a pump and it opened effortlessly)

Now I am a bit lost on where to continue my search for what could be the cause of this problem. My most recent research points towards a broken EGR solenoid but I am not sure, from what I read there is a way to measure the function of the EGR system while driving with VCDS right? If anyone knows how I will be one happy swede!

All ideas are welcome as I am officially lost!

Regards from Sweden!


Here is the fault log from VCDS: ( There are some other ones there as well which I am also trying to fix so if you have and idea about any of them those are very welcome!)


4 Faults Found:
001796 - Clutch Switch (F36)
P0704 - 001 - Implausible Signal - Intermittent
Freeze Frame:
Fault Status: 00110001
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Time Indication: 0

Freeze Frame:
RPM: 0 /min
Torque: 0.0 Nm
Temperature: 38.7°C
Voltage: 12.31 V
Bin. Bits: 0

005491 - Left Engine Mount Solenoid Valve (N144)
P1573 - 001 - Open Circuit
Freeze Frame:
Fault Status: 01100001
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 104384 km
Time Indication: 0
Date: 2016.03.28
Time: 23:00:09

Freeze Frame:
RPM: 0 /min
Torque: 0.0 Nm
Speed: 0.0 km/h
Voltage: 12.24 V
Bin. Bits: 1
Bin. Bits: 1
Bin. Bits: 1

008194 - Particulate Trap Bank 1
P2002 - 001 - Efficiency Below Threshold - MIL ON
Freeze Frame:
Fault Status: 11110001
Fault Priority: 0
Fault Frequency: 2
Reset counter: 255
Mileage: 104387 km
Time Indication: 0
Date: 2016.03.29
Time: 20:13:36

Freeze Frame:
RPM: 1953 /min
(no units): 582.8
Pressure: 0 mbar
(no units): 1.0
Temperature: 365.8°C
Absolute Pres.: 10.2 mbar
Temperature: 5.4°C

001025 - EGR System
P0401 - 002 - Insufficient Flow
Freeze Frame:
Fault Status: 01110010
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 104405 km
Time Indication: 0
Date: 2016.03.29
Time: 20:37:44

Freeze Frame:
RPM: 1218 /min
Torque: 89.7 Nm
Speed: 57.1 km/h
Duty Cycle: 92.6 %
Duty Cycle: 20.9 %
(no units): 164.5
Duty Cycle: 18.1 %

Readiness: 1 1 0 0 0