This is the point on which i will always stick to (within reason, i will happily pay for all justifiable diagnosis time, and i am lucky enough to have had very few run-ins).
What i will not pay for is for somebody to replace parts which were not needed. As you point out, it is of no concern of mine if they have wasted all morning replacing something which they have incorrectly diagnosed. Mistakes happen in business which i accept, but i expect the business to write them off as a loss, why should the motor industry be any different?
I do not think it unreasonable to expect correct diagnosis first time - they are selling themselves as experts. If they are in any way not sure then they should not tender for the work, either that or when they do blag it, and then get it wrong resulting in a loss to them, they need to accept that loss - just as every other type of business would.
I do not think that this is at all unreasonable, and tbh i am amazed anybody accepts it![]()
Thats my view, im just not paying for **** ups, if you cant do a job properly dont do it, or certainly dont ask me to pay for it.
Im lucky iv got my garage of choice for each of my main makes of cars i buy, and none of this ever comes into our relationship.
These nightmare garages thrive on shy and retiring people caving in, well not me.