P1038 code

Hello,
my vehicle has the check engine light, the track off, and 4WD on, on my dashboard for two years, the went off for a or a couple of of months then on again, I went to a couple of mechanics and the P1038 bank 1 sensor 2 code comes up every time, so I started by changing the oxygen sensor twice (purchase from Toyota dealer), then I changed the engine computer on left side, then checked all the wiring from computer to O2 sensor, and clear up the code and after forty minutes they lights are on again every time, please I need an expert help. Lots of thanks.