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I need help, any hints would be appreciated!
I got these codes thrown when I VAG'ed my baby. The cats are removed, so the emissions isn't a worry.
VAG-COM Version: Release 404.0-US

Control Module Part Number: 8D0 907 551 M
Component and/or Version: 2.7l V6/5VT G 0001
Software Coding: 06711
Work Shop Code: WSC 63351
5 Faults Found:
16805 - Warm Up Catalyst: Bank 1: Efficiency Below Threshold
P0421 - 35-00 - -
16815 - Warm Up Catalyst: Bank 2: Efficiency Below Threshold
P0431 - 35-00 - -
16825 - EVAP Emission Control Sys: Incorrect Flow
P0441 - 35-10 - - - Intermittent
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-00 - -
16685 - Cylinder 1 Misfire Detected
P0301 - 35-00 - -

THANKS!
Julia

Removing the cats could cause all sorts of error codes - I doubt that too many people on this forum are running without cats (we're all very 'green' ). What did you do with the Lambda probes from the cats?

Have you tried asking the question on the VAG-COM forum on AW?

Nige.

Certainly these 2 codes are as a direct result of removing the cats.

16805 - Warm Up Catalyst: Bank 1: Efficiency Below Threshold
P0421 - 35-00 - -
16815 - Warm Up Catalyst: Bank 2: Efficiency Below Threshold
P0431 - 35-00 - -

Put your cats back in dufus.

EVAP low flow and cat low efficiency are cos the cats have been removed.
Random cyl misfire and misfire on cyl 1 will be created at the same time.
Simple way to start would be to swap coils for cylinder 1 and 2. Clear DTC memory and roadtest vehicle.
If cyl 2 now shows misfire, replace the coil.
If cyl 1 still says misfire, problem is inside cyl 1 and could be a closed up or damaged plug.
If plug is ok, may be injector or even low compression due to valve/ring or gasket leak.
A B6 S4 with this fault WOULD be a coil fault.