Jim, the following video might be worth watching. There's no commentary but it seems the error code can be resolved by stripping down the door latch mechanism and giving it a good dose of contact cleaner:
https://www.youtube.com/watch?v=HlYGjZbVkDg
EDIT: For the fuel cap error, is it a case that the fuel cap isn't locking? If so, then it might be another case of some lubrication being needed to resolve the situation. The following video shows how to remove it from a B8 A4, but the principle should be the same. Rather than remove it completely from the car in the video, on the back of the actuator is a small hole. Spray a liberal dose of contact cleaner in that and try locking/unlocking the car several times.
https://www.youtube.com/watch?v=KnW0Qpc09To
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2001 A8 D2 FL 3.7 Q - LPG Conversion, Engine: AKC, Gearbox:FBB, Colour:LY5X Aqua Blue pearl effect, Interior:WJ light beige/dark beige valcona leather with burr walnut inserts
My DIY jobs - Replaced alarm horn, Replaced Coolant Temp sensor, Updated RNS-D firmware, Installed Reversing Camera and Digital TV, Dashcam Installation, Retrofitted Rear Blinds, Auto-Dimming Rear View Mirror, Chrome Boot Struts
Sold!  2008 S8 D3 5.2 V10 - Engine: BSM, Gearbox:KLW, Colour:LY7F Suzuka Grey Pearl Effect, Interior:Black/Black with Silver/Black valcona leather with carbon atlas inserts, Bang & Olufsen, Heated windscreen, Soft-close doors, TV, DAB, AMI, Quad Zone, Auto Boot, Auto dim Mirrors, Keyless entry, PDC with rearview camera, AFS II Headlights
My DIY jobs - Fan Jet Windscreen Washers, Retrofitted Electric Side Blinds
Last edited by steamship; 7th March 2021 at 12:39 PM.
Reason: Fuel Cap Info
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