The check engine light has been on since I bought the PIU. Codes P0053, P0157, P0158, P2251. These all point to 02 sensors in Bank 1, Sensor 1 and Bank 2 Sensor 2. Both are relatively easy to change. I also changed my Valve cover gaskets, spark plugs, and rebuilt the ignition coils.

This video is for the 3.5L Flex and is the same design for the intake manifold and valve covers and is more comprehensive for the tear down and reassembly:    • How to Replace Valve Cover Gaskets 20...  

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0:00 Reading Engine Codes and Identifying Sensors
3:14 Bank 1 Sensor 1
8:07 Bank 2 Sensor 2
14:10 Bank 2 Sensor 1 and Bank 1 Sensor 2
15:10 Valve Cover Gaskets
19:42 Clearing the Codes