I am replacing the cat converter and exhaust system on my 1998 v70xc 2.4L turbo and can not figure out which O2 sensors will work ? Volvo wants $200/ea, but Bosch offers both up stream and downstream for $100/each ? Bosch needs the chassis number to spec the part -- does anyone know where the chassis part # is located? Any help or general information would be greatly appreciated. Thanks !
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