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S 60 Howling noise, rough idle after warm up S60 2004

Have a 2004 S60 with 185k miles, recently had oil pump seal replaced to correct oil leak. Car ran fine for several weeks, then developed a sort of howling/ whistling noise at idle and seems to labor at idle. Noise is not present while driving.

Had my favorite Volvo indy listen to everything, and it checked out OK. OBD posted a P0420 Cat code, which indy thinks is unrelated. We are stumped.

Ideas?

Thanks in advance,
Greg
--
Greg Caggia '93 240, '93 940 & '04 S60






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