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How to Diagnose and Repair a Failed Turbocharger on Your Diesel Truck Turbochargers are the heart of your diesel engine’s performance. They provide the boost needed for towing, hauling, and efficient highway driving. But when a turbo starts to fail, it can quickly affect power, fuel economy, and even engine health. Knowing the symptoms of a bad turbocharger—and catching them early—can save you from costly repairs or a roadside breakdown. Here’s how to recognize the warnin …