Volvo S60 hissing sound on startup and rattling noise during turns with loud interior idle on Volvo S60

Some Volvo S60 owners report experiencing a hissing sound on startup, which may be related to issues with the PCV diaphragm or a leaking O-ring on the oil fill cap or dipstick tube. Additionally, some owners note a rattling noise during turns, potentially caused by loose items inside the car, a faulty exhaust system, or failing suspension components. Furthermore, a loud interior idle has been reported, which could be linked to problems with engine components like lifters or piston damage, as well as issues with the idler or tensioner pulley bearings. Given the complexity of these issues, it is advisable for owners to consult a qualified mechanic for accurate diagnosis and prompt resolution to maintain optimal vehicle performance.