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Diagnostic charges—relevant or rip off?

A “check engine” light comes on in your vehicle. Now what?

Thirty years ago, the answer might have been as simple as a mechanic popping your hood and saying, “Ahhh, that's your problem.”

Today, however, emission standards, computer technology and high-tech engine development have created tremendously complicated machines that require sophisticated equipment and well-educated technicians to properly diagnose automotive faults.

When a “check engine” light comes on, the problem could be as simple as a loose gas cap, or as complex as internal engine trouble. A diagnostic computer is attached to the vehicle's computer to display fault codes, directing the technician to where the problem lies.

These codes, however, do not tell the technician what part is malfunctioning. They only indicate the failed circuit or system. The technician then follows the specific diagnostic procedures laid out for that make and model of vehicle. The problem could be a part malfunction, a wiring problem, or even a programming error in the car's computer.

As the technician tracks down the fault during these secondary diagnostic services, he or she may be directed to replace a part before any additional diagnostics can be performed. This doesn't mean that the part will fix your vehicle—it may, but more likely the problem lies deeper.

To complicate things, every year manufacturers make vehicles more technologically advanced. Their aim is to make the vehicle more consumer friendly—not technician friendly—which makes repairs and diagnostics even more difficult.

Charges for an initial diagnostic check could start at an hour for labor and go as high as four or five hours. Secondary diagnostic services can require additional hours as well as the cost of any parts needed. It's not uncommon for diagnostic charges to be more than the actual repair cost, because in today's vehicles more time is often needed to find the fault than to fix it.

When considering these costs, remember that any good repair facility has made a substantial financial investment in well-trained technicians and sophisticated diagnostic equipment. More importantly, good repair facilities will take the time to explain possible diagnostic charges before they begin, so you'll better understand the costs incurred.

AAA Connection

AAA Colorado has certified more than 65 repair shops around the state in itsAAA Approved Auto Repair facility program.