Audi=No fault code, no idea
Could be anything but its telling you to change gear !! Once you try and pull when the engine cant manage it your going to get backlash in just about everything that has a tolerance from chains/belts/valves/cams etc..even big ends and little ends !!
You put your foot down, pour in fuel that dosnt all burn so it pops in the pipe. It also raises the compresion ratio which can break down oil films on little ends as the loading increases. In short, dont do it..
Ibis white Revo S3 and now matching Vivaro LWB HR 2900 :-)
Many people are alive because its illegal to shoot them.