Owner's book · not a shop
Know the car. Then the window. Factory specs in plain English — don't authorize until you can say this at the counter.
RO glossary
Beginner · short stepsExpert · spec · code · mm
Look up the slang on the ticket. Read the trap on that line.
Invoice slang: LOF, MPI, R&R, NTF, shop supplies, 'while we're in there.'
Invoice slang
Try cabin-filter, LOF, or flush
ticket
Work sent outside the shop. Alignment rack down the street, machine the rotors, tint, programming.
Say · Who is doing it, and what is their line on my ticket?
Sublet plus a markup is normal. An unmarked sublet is how you lose the old part.
diag
Software or a control unit. Needs the right battery voltage and factory software.
Say · New module or a reflash of the old one? TSB number?
A module because of a U-code. Read /jobs/obd — silent is often voltage.