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I have had the Differential Control Off message on my 90 S4 for a while. Finally attached my Theo tool - turns out the front right ABS speed sensor is knackered.
I have had the Differential Control Off message on my 90 S4 for a while. Finally attached my Theo tool - turns out the front right ABS speed sensor is knackered.
i'd say that's good news and a relatively easy solution; get it done!