Looking for some help, my A3 is not very well and its getting a bit annoying. First of all the ECU warning light is on, can't remember the fault codes but its got an air leak and its not idling very well, unsure of where the leak is. Is there any common faults with this engine? It runs fine out on the road but a bit rough when idling. Second and more importantly just yesterday the oil pressure warning came on the dash....now it goes off for maybe 20mins or so then comes back on....what could it be?oil pump?the pressure switch mis-reading? Its a wee bit tickety sounding on start up but when at temperature its sounds fine. Any thoughts? Really need it fixed and can't get it to the garage until friday. Thanks in advance.