Engine warning lamp

danotto

VAG HUNTER
just had my cambelt changed with the water pump,got the job done private by a bloke who ive known for ages he works for audi and has been great with all of my previous cars,but anyways driving back from his the yellow engine warning light pops up,the engine doesnt misfire and hasnt lost boost,no noises etc,does anyone know what this could be?
 
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