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I changed fuse D6 and it appears to have fixed the issue!
Thank you for the welcome! Is there a possibility of a fuse that's blown?
2009 C4S Cabriolet with Sharkwerks/EVOMS ECU flash and Fabspeed headers/cats has a persistent CEL with codes P0031, 37 51 & 57: H02S Heater Control Circuit Low Bank 1 Sensor 1 (P0031) Low Bank 2 Sensor 2 (P0037) Low Bank 2 Sensor 1 (P0051)' Low Bank 2 Sensor 2 (P0057) Both pairs of upstream and downstream 02 sensors have been replaced and the CEL codes erased, but the same CEL codes pop up at the next startup. Any ideas on the source of the errors and the fix!?