Hi , I have 2011 b7 bluemotion passat . I had engine light show up and the garage read numerous codes and cleared them and all was ok for a week , then after heavy rain the light came back on for a day and now its off again . I popped the bonnet , cleaned out lots of dead leaves and compost like substance from under the passenger side windscreen scuttle and will do the driver side tomorrow , but cant seem to locate the drainage plugs . I am wondering if the heavy build up of debris caused water to get near the ecu , thus throwing up codes and engine light , and cleaning this area out will at least eliminate that from any possible causes , I did the same on my previous car , Audi a6 2002 but just pushed the drain hole bungs through .Does anyone know exactly where I can find these drain holes under the scuttle trim? Thanks in advance