Repalce front O2 sensors

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Hello, My 2001 Audi A6 2.7T has the check engine light on. The codes were found to be P1131 and P1113 (resistance too high on banks 1 and 2 of sensor 1). What is roughly the cost for parts and labor for replacing the O2 sensors (both universal and OEM)? Thanks you for reading thus far. hope to hear some true estimates on the cost of repair involved. Thanks, L