Socket in the vehicleIndicator lamps and fuel gauge
Fig. 129 In the instrument cluster: Variants
A and B: fuel gauges for petrol and diesel. Variant C: fuel gauge for autogas
First read and observe the introductory information
and safety warnings 
Lit up
Needle position 
Possible cause †...
Refrigerant Oil
Refrigerant oil mixes with the refrigerant (about 20 - 40%,
depending on compressor type and amount of refrigerant) and
circulates constantly in the system, lubricating the moving
parts.
Special synthetic refrigerant oils, for example,
...
Warning and indicator lamp
First read and observe the introductory information
and safety warnings 
Lit up
Possible cause
Solution
Dual clutch gearbox DSG® overheated.
Do not drive on!
Move the selector lever to position P and leave the gearbox
...