Im getting code P0137 for chevy silverado, What am i missing?

Question

I have changed , catalytic converter, changed bank 1 down stream o2 sensor, changed spark plugs and wires , changed purge valve and changed evap control system silonide

Answer 1

P0137 Bank 1 Sensor 2

Sensor 2 is the downstream 02 sensor , which is after the catalytic convertor, depends on the type of system you have there is the case grounded 02 sensor and the isolated 02 sensor, if you have the grounded case 02 sensor on the transmission bell housing there are ground connection, those connection not connected back on set a P0137 and it also set a P0157, (it does not have to set a P0157 the nearest sensor affected is on Bank 1 that driver side, ) on certain month per year the ground connection can be right near the ABS module. (one famous reason for ABS module failure)