P0137

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"P0137 is the OBD-II generic code indicating the O2 sensor for bank 1 sensor 2 is failing to increase the voltage output above .21 volts indicating excessive oxygen in the exhaust. This code occurs when the engine control module (ECM) sees the voltage of the O2 sensor for bank 1 sensor 2 below .21 volts when the ECM has commanded the fuel to a targeted rich condition on that bank of the engine."

Most common culprits seem to be O2 sensor. Exhaust leak. Bad wiring.

 

I doubt you will get that code to go away unless you put the exhaust system back to stock.

I don't know how the ECU would figure out how to adjust the fuel mixture with no cats.

Maybe someone knows more.