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2012 and up Chevrolet Engine’s 1.4L Turbo Engine Knock with Knock sensor fault code Troubleshooting. DO NOT ATTEMPT TO REPLACE PARTS IF UNDER QUALIFIED. TIMING CHAIN AND CAMSHAFT MUST BE REMOVED TO REPLACE PARTS. But to check the issue. Simply take off the valve cover and check tightness/ clearance of any suspicious valve lifters. They should NOT budge with your finger. If they do, they’re loose!