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Sound localized to the catalytic converter. Replacement pending part availability.

Appreciate your reply and remarks about having to move the exhaust system out of the way. Yes, very glad they heard it (the service advisor heard the first sound (whirring) and then this latest sound, too. Very grateful that he heard what we heard both times! Hopefully we'll know more tomorrow...

Sound heard by service advisor when he rode along with me this morning and by mechanics, too, but they cannot localize. Service advisor and I agree that it sounds like it's coming from the left/driver side. They are wondering if it's something with the exhaust system. I would expect to hear the...

Thank you, jo7hs2 and Peter. Goes to the dealer tomorrow AM - still under powertrain warranty. Will be asking service advisor to ride along to listen for the sounds we hear. Will post results/next steps. Again, thank you.

Correct, exactly as you described. Never heard it before PTU/PTO replaced. And it usually cannot be heard again after the vehicle has traveled for 20-30 minutes and is at ordinary operating temperature. Should I be concerned? Regarding PTO vs PTU: Ford identifies it as a PTO on the vehicle work...

Sounds like gears meshing is trying to mesh. Not very loud and only through about 25-30 mph.

PTO made unusual whirring sound upon decelerating near 30 mph . Replaced under warranty. Now odd sound upon acceleration at 5 - 10 mph, goes away after a few seconds. After traveling at least 30 minutes, unable to hear sound. Can be heard again after next day from cold start. And so it goes day...

Limited with 4WD. PTU seal leak at 45,000 - oil drops on the garage floor. Dealer replaced seal under warranty. Upon next drive to work, immediately heard whirring sound at 35 - 15 mph when decelerating. Took it to dealer - they heard it, too, and replaced PTU. Now, with new PTU, we hear a...