HOW TO REPLACE FRONT OXYGEN SENSOR on 1999 Volvo S80

HOW
DO IREPLACE FRONT OXYGEN SENSOR

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1 answer
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.