Hello everyone! I am new to this forum so I hope I'm posting in the right place. I have a 1993 Oldsmobile Cutlass Ciera in great condition. (90,000 Miles) Recently the engine light has started to flicker on and off, mostly after highway driving. I checked the codes and it gave me the 12 intro code and then flashed two codes , 43 and 44. Does anyone know of anything that could cause both of these codes to flash at the same time? Seems as if its the 02 sensor and knock sensor. Any help would be greatly appreciated. Because everything is running fine and there has been no change I'm assuming it could be some sort of sensor issue. Thanks!