P0137 Chevrolet -

Question

I changed my downpipe last Monday, and i drove it for 2 days. Then the CEL came up so im not sure how to solve that problem. Please help!
Thank you!

Answer 1

P0137 H02S circuit low voltage Sensor 2

P0137 are mostly seen when either the 02 sensor is not properly torque down , It is also seen when there is exhaust leak prior to the catalytic convertor

 Here a P0137 was set do to leak in the weld when a catalytic was replaced,