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CEL back on after replacing o2 sensor S70 1999

More info;

When I pulled the old o2 sensor (Volvo/Denso) I saw little pieces of ceramic/porcelain in the tip. Could cat be breaking down, plugging passage so that 600 degree temp is not read in time? Klaus I know you've said; bad cat = no go, but performace is good. Smell is off a bit, but no strong sulphur.

Could I just be trying to clear the code to soon?






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