I need some help with some fault codes please

[DaveA3-TDI]

Hello.
The emissions control light has come on yesterday on my mates 1.9 TDi A3, the car has been scanned and these are the faults we get below:

Address 01: Engine Labels: 03G-906-016-BKC.lbl
Part No SW: 03G 906 016 CC HW: 028 101 183 2
Component: R4 1,9L EDC 0000SG 6231
Revision: 12345678 Serial number: AUX7Z0E4FNJ0D8
Coding: 0000071
Shop #: WSC 06314 000 00000

3 Faults Found:
17056 - Cylinder 2 Glow Plug Circuit (Q11): Electrical Fault
P0672 - 000 - -
Freeze Frame:
RPM: 966 /min
Torque: 96.0 Nm
Speed: 0.0 km/h
Load: 8.2 %
Voltage: 14.29 V
Bin. Bits: 11000100
Temperature: 13.5°C
Bin. Bits: 10110000

17058 - Cylinder 4 Glow Plug Circuit (Q13): Electrical Fault
P0674 - 000 - -
Freeze Frame:
RPM: 966 /min
Torque: 96.0 Nm
Speed: 0.0 km/h
Load: 8.2 %
Voltage: 14.29 V
Bin. Bits: 11000100
Temperature: 13.5°C
Bin. Bits: 10110000

16785 - EGR System: Insufficient Flow
P0401 - 000 - -
Freeze Frame:
RPM: 1344 /min
Torque: 62.0 Nm
Speed: 63.0 km/h
Load: 17.3 %
Duty Cycle: 14.7 %
Bin. Bits: 11000000
Mass Air / Rev.: 260.0 mg/str
Mass Air / Rev.: 530.0 mg/str

Readiness: 1 1 0 0 0

The glow plug fault was cleared last time but has come back, but am I correct in thinking that the 16785 fault means the EGR valve needs replacing?

Thanks for your help in advance.

Dave

 

[Lewis583]

More than likely yes, it wants taking off to see if it's gummed up which is restricing the movement of the valve

 

[NHN]

You need to check the glowplug loom for any damage, rocker cover of & have a looksy inside, if no obvious external damage, dont think there's a seperate fuse for dual glowplugs, so point to wiring in 1st instance or even the plugs themselves, when I had cover of a mates car I was surprised how flimsy or loose the plug loom connectors were, although doubtful could be they're not seated 100%.

As lewis advised, check egr for crap & gundge given its a bkc, probably caked up, clean it up & check for movement, brake cleaner is good for this.

 

[Gti Jazz Blue]

You'll probably need replacement gaskets too.
I got through two spray cans of brake cleaner - cleaning up the EGR from my BKD.
If you have the time it might also be worth doing the Intake Manifold as that is probably well chocked up to.
Paul

 

[DaveA3-TDI]

thanks everyone, I will update you in due course.

 

[NHN]

TBH I've done 2 8P's & didnt use new gaskets, but its a fair point to make, as they can rip upon removal, wont hurt to replace.

IM on mine when I replaced turbo was caked up with half an inch maybe more of crap, I removed the whole lot, sunk it in a cleaning liquid & scrapped areas I couldnt reach very well & it was as new when done, so certainly I'd consider doing it to give the air better surfaces to glide across.