There are two sensors on each side one pre cat and one post cat. Check that they are both plugged in. Antoher issue I have seen is that some cats do not have the bungs in the same height or position as the factory cats. Sometimes installs just dont seat the sensor all the way as a way to help the sensor cable reach the wiring harness plug.
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2015 F06 M6 Silverstone Metallic II, Individual Full Leather, B&O, Night Vis, CCB, RKAutowerks (CP Rods/Pistons, DI Cams, CF Intakes, Coated DP's & Billet Diff Brace), InfinityAuto Turbo Inlets, Mishi Oil Cooler, JB4, XHP S3, BM S3
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