What sensor mugshot need to be replaced if the issue continues?

Question

The air conditioning unit was replaced. The check engine light comes on and stays on. And did not clear. The read for the code was P 1157

Answer 1

P1157 A/F sensor circuit high voltage

This code , if you clear it it would set right away within the ignition cycle, circuit high mean your somehow disconnected. this is one of the job of the ECM to look for open circuit  which you have on the A/F sensor, grounded circuit and short circuit, Check you connection and along the harness of the A/F sensor some thing on that wire is open or disconnected.