Some shops charge a flat rate for labor on auto repairs. This published rate is based on an independent or manufacturer's estimate of the time required to complete repairs. Others charge on the basis of the actual time the technician worked on the repair. If you need expensive or complicated repairs, or if you have questions about recommended work, consider getting a second opinion. Find out if there will be a diagnostic charge if you decide to have the work performed elsewhere.
Many repair shops charge for diagnostic time.
Shops that do only diagnostic work and do not sell parts or repairs may be able to give you an objective opinion about which repairs are necessary. If you decide to get the work done, ask for a written estimate. It should identify the condition to be repaired, the parts needed, and the anticipated labor charge. Make sure you get a signed copy. It should state that the shop will contact you for approval before they do any work exceeding a specified amount of time or money.