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2008 Wrangler X O2 locations and firing order

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20K views 2 replies 2 participants last post by  Proline251  
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#1 ·
Check engine light is on and an analysis showed a PO137 code indicating that Bank 1, Sensor 2 has low voltage. I have a diagram which indicates that Bank 1 is on the driver side and Bank 2 is on the passenger side. However, finding a firing order diagram for my 3.8LV6 has proven difficult. Help would be appreciated.
Bob Warren
 
#2 ·
As viewed from the driver's seat, Bank 1 is on the right side of the engine.

Bank 1 includes cylinders 1, 3, and 5, numbered from front to back.
Bank 2 includes cylinders 2, 4, and 6, numbered from front to back.

Firing order is 1, 2, 3, 4, 5, 6.

Regarding the oxygen sensors, upper is 1, lower is 2.
 
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