Audi A6 “check engine” light service This Service page instructions guide describes how to service and repair Check Engine Light issue on Audi A6 models and can be used for: Audi A6 2.7 – 3.0 TDI released from 2004 to 2008 with V6 engines but it might be also applied on other Audi engine configuration models that have similar engine intake systems and engine setups, like Audi A3 – A4,
