2004 VW Golf Vibrated Only at 70 MPH: One Tire and a Broken Spring Shared the Cause
See how a VW Golf's narrow 67–73 mph vibration window led to an out-of-round tire, a broken spring and a measured 76% improvement.
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2019 Hyundai Tucson P0302 Survived a Coil Swap: The Spark Plugs Closed the Case
See how a 2019 Hyundai Tucson P0302 was closed by spark-plug replacement without turning brown corona staining into a universal diagnosis.