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| D3 - Interior Electrics Airbags, Sensors, climate modules, instrument clusters, switches etc |
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#2
25th March 2021, 11:07 AM
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Being on the incorrect wheels would have definitely given an incorrect reading, unless the car was 'told' is was on 20" at the time. If it was coded then the car now thinks you are on 20" wheels and hence the speedo is out.
A quick search, I found this for VCDS or reference, the VCDS coding slot: 17 - Instrument byte 3 bits 0-2 "tire circumference" If you don't have VCDS, I would invest in one as they are invaluable for our cars or indeed any VAG car
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2008 (facelift) S8 with B&O, ACC, glass sunroof, reversing camera, front and rear heated seats, ceramic brakes, homelink, electric side and rear blinds, ski load through, heated fan washer jets, remote boot closing, de-flapped manifold, fridge, umbrella holder 
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