Recently our 00 ML320 check engine light came on so we took it to Autozone to have the codes read. The computer said that there was a fault at both O2 sensors on bank 1 side (pre and post cat). The truck has 71k miles on it and after reading the 8 yr / 80K EPA warranty I'm wondering if the replacement of the O2 sensors should/will be covered by the warranty?

TIA