Question

I think I wired my O2 sensor wrong I bought the cheaper Bosch one  I just put the same color wires together and now I'm getting code P0138 which is high-voltage did I wired wrong or is there something else wrong

Answer 1

P0138 Front H02S circuit high input.

This depends on the emission that you have, You can use aftermarket , When it comes to the 02 sensor there a California emission and a Federal , if the parts incorrect you would set this code. When it comes to P0138 the ECM  does not see the input voltage  that or you not even connected.