Hissing coming from rear when side/headlights are activated

A2SPORT

Member
Hey all

It's almost two months to the date, My A2 seems to have developed a strange intermittent fault. When I switch on the headlights/sidelights there seems to be a hissing sound coming from the rear, tought it's the fuel pump at first but then discovered it only accrues when switching on the headlights/sidelights. its had a scan done but it's not trowing up any fault codes. please advise....

Cheers,
 
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