Home › Audi › 2008 › S8 › Repair and Diagnosis (Single Page) › Engine Performance › Ignition System › 5.2L - Generic Scan Tool, Engine Code(S): BSM [Ignition/Glow Plug System - Generic Scan Tool] › 28 - Ignition/Glow plug System › Ignition, servicing › Knock Sensor, Checking › Knock Sensor, Checking