Hissing sound

2010 Peugeot 207
Car: Peugeot 207
Year: 2010
Categories: Running Rough, Starting & Power Loss
Only heard it by chance today when standing next to the car and it is idling, so am unsure as to when it may have started; but there is what sounds like a hissing sound coming from the rear passenger side, tyres are fine but have read something suggesting it may be the fuel pump, or am guessing it's coming from the exhaust ?

Car runs ok without a problem, but that doesn't mean to say there isn't anything wrong with it though.

Any advice/the severity of it would be greatly received.

Thanks for your time in reading this
Problem added: May 27, 2015 (8 years ago)
KP74

Points: 1
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