Hi all. I have a B6 A4 with the ALT motor which is given me an intermittent 18020 fault reading.
There does not seem to be much information out there as to how to fix this. Anybody got any ideas?
I'm not sure if they are linked but I also had the below faults.

01794 - Control Module - Incorrect Chassis (VIN) Number
000 - - - Intermittent
Freeze Frame:
Fault Status: 00110000
Fault Priority: 2
Fault Frequency: 4
Reset counter: 99
Time Indication: 0


01317 - Control Module in Instrument Cluster (J285)
004 - No Signal/Communication - Intermittent
Freeze Frame:
Fault Status: 00100100
Fault Priority: 2
Fault Frequency: 2
Reset counter: 99
Time Indication: 0


00474 - Control Module for Immobilizer
004 - No Signal/Communication - Intermittent
Freeze Frame:
Fault Status: 00100100
Fault Priority: 2
Fault Frequency: 1
Reset counter: 99
Time Indication: 0


01217 - Side Airbag Igniter; Driver Side (N199)
001 - Upper Limit Exceeded - Intermittent - MIL ON
Freeze Frame:
Fault Status: 10100001
Fault Priority: 1
Fault Frequency: 5
Reset counter: 255
Time Indication: 0