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HOW TO REPLACE FRONT OXYGEN SENSOR on 1999 Volvo S80

HOW
DO IREPLACE FRONT OXYGEN SENSOR

Asked by for the 1999 Volvo S80
You must remove the cat assembly off the two turbo assembly, (total of 8 bolts) then the two bolts near the muffler, then lower it down as a whole. It's an involved process and have a lot of patients with those exhaust bolts and lot's of penetration oil.