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Explore a real-world automotive diagnostic case involving a 2007 Chevrolet Silverado Classic with persistent knock sensor codes that returned even after parts replacement. Follow along as an experienced technician investigates why a knock sensor and harness replacement at another shop failed to resolve the check engine light issue, despite the parts being corroded and water-damaged as expected. Learn diagnostic techniques for troubleshooting GM truck knock sensor problems, understand the relationship between fuel trim issues and knock sensor codes, and discover why simply replacing parts doesn't always solve the underlying problem. Gain insights into proper diagnostic procedures for these common GM truck issues, including the use of alcohol content resets for fuel trim control and systematic approaches to identifying root causes rather than relying on parts swapping.
