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Can and O2 sensor be welded in near the end of an exhaust system or does it have to be right on a primary near the engine where it is hottest? I've always had the impression that O2 sensor need to be very hot to operate correctly but my exhaust is ceramic coated. The "muffler" at the end isn't...

Hi all Basically I've taken the front cam cover off to replaced a knackered gasket. It's all ready to go back on, but in the process of taking the cover off one of the rubber plugs came off out of the camshaft cap housing. Its no. 27 on the fiche below...