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Follow along with this automotive diagnostic video as it continues the investigation of a persistent knock sensor code on a 2007 Chevy Classic. Dive deeper into advanced troubleshooting techniques when previous repairs by another shop—including knock sensor and harness replacement—failed to resolve the issue. Learn systematic diagnostic approaches to determine whether a faulty PCM (Powertrain Control Module) or a defective "new" replacement part is causing the knock sensor signal to drop out only when the PCM is connected. Master the critical thinking process required to avoid unnecessary parts replacement by using proper testing procedures and logical deduction. Discover how to differentiate between genuine PCM failure and faulty replacement components through methodical electrical testing. Gain insights into professional diagnostic methodology that prioritizes accurate problem identification over guesswork, helping you develop skills to tackle complex automotive electrical issues with confidence and precision.
