id check for any corrosion in the bulb holder, mayb check your earths

i had a problem like this on my old mk3 fiesta but it was both sides, some days it would randomly not want to work unless i really pushed the stalk up hard. could be a faulty connection on the stalk tho

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Audi A4 Cabriolet 2.5TDI 163 Sport
Full Interior Lighting Pack - Puddle Lights, Footwell Lights, Door Markers, Handle Ambient Lights, Air Vent Illumination, Armrest Illumination, Roof Ambient Lights. Auto Dim Rear View Mirror, Cruise Control, Full DIS, Genuine 6 Disc CD Changer in Glovebox, RNSE, Remote Windows, Parrot Bluetooth, Storage Pack, Full Leather, Heated Mirrors