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'01 S60 code PO455 Emissions System failure S60 2001

Group:
I have been resetting the CE light, fault code PO455 and dash message by disconnecting the battery for 10 minutes or so, but the fault code keeps coming back. Other than the gas cap, what is the most likely source of a a leak?
I have heard of a valve of some kind near the charcoal(?) cannister or the connections to it. Repairs will be done by a good independent and I would like to have a few opinions of where to start replacing parts.

Fortunately, the car runs fine.

-- S'V'






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