I know this is hella late but I'm getting P0031 and P0037 on my 05' RS. I replaced both the a/f sensor and the o2 sensor and disconnected the batter and tried to clear the code but CEL comes back on immediately after start up. I don't know what else to do. I know you can check resistance or something in the wires to see if the sensors are getting voltage, but I don't know which wires to check and what the voltage or resistance should be. FML.... If you guys got any suggestions for me it would be much appreciated!! Thanks!