I had superchips map on, no error, had revo loaded onto the car, got the errror.  I was advised to change the hpfp, maf sensor etc etc
got a refund from revo, no error code with stock map. pdtuning remap, shark performance remap.
If you phone revo directly, they;ll tell you it comes up with that same fault with a few cars, mostly s3's they told me.
There were about half a dozen people at gti international that had revo loaded onto the car that had exactly the same fault code appear aswell. 
This was teh fauklt code I had 
008584 - Bank 1; System too Rich at Idle 
               P2188 - 008 - Implausible Signal
             Freeze Frame:
                    Fault Status: 01101000
                    Fault Priority: 0
                    Fault Frequency: 1
                    Mileage: 58707 km
                    Time Indication: 0
                    Date: 2000.00.00
                    Time: 14:31:05
             Freeze Frame:
                    RPM: 814 /min
                    Load: 30.2 %
                    Speed: 10.0 km/h
                    Temperature: 68.0°C
                    Temperature: 29.0°C
                    Absolute Pres.: 980.0 mbar
                    Voltage: 13.970 V