2018 Vauxhall Mokka P0300: A Spark Escaping Outside the Cylinder
A misfire code identifies a combustion problem, not a fuel shortage. This Mokka needed attention to the plug insulation and coil-cassette connection.
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Reading Spark Plugs: Compare Cylinders, Then Confirm the Cause
Use spark-plug appearance as cylinder-specific evidence, preserve plug position, and confirm fouling, overheating, or deposits with scan and mechanical tests.