Check engine light came on my all my 2004 Audi Allroad Quattro.

Shut the engine off. If you dont' work on cars then it's time to call a shop. This could be one of a few dozen issues. If you have a scanner you can scan for codes but with smoke coming from the engine that may not help.Use this link to find a good shop near you. https://repairpal.com/repair-shops Alex