P0138
O2 Circuit High Voltage
(Bank 1, Sensor 2)

I decided to just replace the rear O2 sensor at the cat converter

I used NTK 23099 sensor

I used 3/8 breaker bar
https://www.harborfreight.com/38-in-...bar-67931.html

I used this 22mm 7/8" O2 socket
https://www.harborfreight.com/78-in-...ket-63702.html

I used zip tie to hang extra cable out of the way

 

One month update. Light still gone, so problem solved!