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Its easy to get hung up on diagnosis and fault reading.
From my perspective if I ask to have the fault codes read I would expect a reasonable charge - say 15 minutes labour plus some contribution to the cost of equipment.
So for STAR I would say its reasonable to expect to pay up to £50.
I would only expect a list of fault codes found.
Diagnosis is a much bigger thing and can involve significant time. A small part of diagnosis is the STAR code readings. Therefore for diagnosis I would expect full hourly whack but nothing extra for STAR as thats just a tool for the overall job (just as a ramp and socket set aren't charged for separately).
From diagnosis I would expect a detailed analysis of whats wrong, which parts and an estimate of cost with an expectation that the diagnosis is correct.
Which is exactly the difference between a STAR test and diagnosis.