Volkswagen Audi 06H905621 Spark Plug High Performance Original Replacement

The VW/Audi 06H905621 spark plug sits inside the threaded hole of the cylinder head, ignites the air–fuel mixture, and is a core engine component for smooth operation. OEM number 06H905621, fits late 2000s Passat and A4 models, installation difficulty medium, approximate labor 30–60 minutes, torque wrench required for proper tightening. If you experience idle shaking, weak acceleration, rising fuel consumption, or hard starting, the spark plug may be worn or heavily carboned and should be replaced.