ROADWORTHY AUTOUnderstand before you authorize

Service guide

Diagnostics

A trouble code is a starting point for testing. It does not, by itself, identify a failed part.

What to discuss with the shop

Write down the exact warning and driving conditions. Ask about the scope and authorization limit for diagnostic time.

Questions worth asking

  • What tests are included?
  • Will I receive the findings?
  • Is the diagnostic fee separate from the repair?

Service scope varies by vehicle and facility. Confirm the exact work and the written estimate before authorizing repairs.

Background: FTC Auto Repair Basics and your vehicle manufacturer’s owner’s manual.

Facilities listing diagnostics

Facilities 1–36 of 72, in alphabetical order.