I bought a ppc diagnostic for my Volvo S40. It is specific to volvo and has been good value. It gives a really good indication of whats wrong. It was about £100
The bit where they key goes into broke, it told me and I got a new one and it fixed the problem. I reckon that made it payback on that one occassion. It' also allerted me to DPF pressure sensor fault and can fix an intermittant wiper error code/fault.
If anything does go wrong you can't fix yourself it gives you more of an insight into what the garage might do, and you can check for any error messages once they are finnished.
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