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“In the beginning there was light...” Wait— that’s not right. Wrong story. In the beginning there was a check engine light. Yes, that’s how this story starts. Bill, a longtime customer of mine, called me one morning about his 2004 GMC Sierra. He was getting ready to head out on a trip, but his truck was running a little rough. We set the appointment, and while I enjoyed a hot cup of coffee, Bill rolled into the shop. We pulled his truck into the diagnostic bay, and my technician scanned the computer for any Diagnostic Trouble Codes (DTCs). What the technician found led me to a series of questions for Bill. Me: “Bill, we found some trouble codes in the computer. Has the check engine light been for long?” Bill: “Oh, that thing? Yeah, it’s been on for a couple years! But it’s been running great.” Me: “Well, it’s running terribly now.” Bill: “True… it just started acting up these past couple of weeks.” What we uncovered was a laundry list of fault codes that had been obviously ignored. He also admitted he’d been topping off his radiator with coolant from time to time. Here’s what happened: it started with a small radiator leak. As the coolant got too low, the engine overheated, off and on, over and over. That constant heat stress finally caused the head gasket to fail. By the time all was said and done, with machine shop work, new head gaskets, radiator, spark plugs, and an oxygen sensor, the bill (no pun intended) came to $3,000. The moral? Bill now “ sees the light ” and knows the cost of ignoring it. Some dashboard warning lights may be confusing, but they’re there for a reason. If a light comes on or a gauge points to a problem, don’t wait. Even if your car seems to be running fine, it’s always safer (and cheaper) to get it checked out before a small issue snowballs into a major repair. Do you see the light? Drive Safe! Brian Bernard – Owner, Automotive Workbench Your Car,… Trusted Care