Well I've got a USB OBD2 code reader interface + diagnostic software for my laptop.
Not tried it on the RR yet but on my Volvo V70 it worked a treat, helped me dianose loads of faults and sort a lot of stuff out for myself.
Most of the readers only do the engine ECU though, so any gearbox, climate control, navigation etc faults you won't be able to read - thats where autologic stuff comes in but thats 4 figures to buy.
My usb reader was really quite cheap - £25 I seem to remember and works a dream. FFRR TD6 06MY. Cairns Blue, Blue Hide. LR 7 Spoke 20" Wheels, S/C Grill and Vents. Privacy Glass and Side Steps
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