Audi A6 ignition coils with OEM numbers starting with 06E were commonly introduced around 2004 when Audi began using the newer V6 and V8 FSI engines. These ignition coils are mostly found on Audi A6 C6 models from 2004 onward, especially engines like the 2.4, 2.8, 3.0, and 4.2 variants.