A photo of the dashboard with the booking
Customers attach a photo of the warning light when they book.
The same afternoon, twice. The first customer arrives 15 minutes late.
Back to back
Every customer after him starts 15 minutes late
With 15 minutes of margin
The margin absorbs the delay, the next car starts on time
Most lost time in diagnostics comes from information in the wrong place: on the phone, on a printout, in someone's memory. Putting it with the booking and on the customer's record fixes most of it.
One technician. Twice a week, a car booked as “a warning light” turns out to need far more or far less time than the slot it got.
hours lost to reshuffling the day each week
hours over a year
of that avoidable with a photo first and the diagnosis booked apart
An illustration, not a measurement. Your own numbers depend on the jobs you take, how customers describe faults and how you split diagnosis and repair.