Don't know if its true or not for your model but do you have a decat in it? Heard that once you put the decat in, it will bring up a cell in newage models and you need a resistor put in circuit to turn off the cell..
P0037 HO2S Heater Control Circuit Low (Bank 1 Sensor 2) is the fault that is showing up have resistor in and cell is still coming with p0037 fault?????????