I recently heard a slight whining noise coming from the undercarriage area. After a day or two it started getting louder. It is now very noticible. I think it is coming from the catalytic converter. Does this sound like a bad catalytic converter or possibly something else?

Also, since researching prices I have read about manufacturers being required to replace bad catalytic converters when under 50K miles. Any truth to this?

Thans in advance for any information.

 

A whine? Doesnt sound like a cat to me. Does it get louder at any time? Is it constant or change with speed/rpm/acceleration?

 

what does the whine sound like. if it sounds like a dentist drill then it could be the turbo going bad. you could also have an exhaust leak somewhere.