P0040: Upstream Oxygen Sensors Swapped From Bank To Bank (Ho2S-11-21)

P0040 - UPSTREAM OXYGEN SENSORS SWAPPED FROM BANK TO BANK (HO2S-11-21)

Description:	The heated oxygen sensor (HO2S) monitor determines if the HO2S signal response for a fuel shift corresponds to the correct engine bank. The test fails when a response from the HO2S being tested is not indicated.
Possible Causes:	Crossed HO2S harness connectors (upstream). Crossed HO2S wiring at the harness connectors (upstream). Crossed HO2S wiring at the 104-pin harness connectors (upstream).
Diagnostic Aids:	-
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
Dedicated NGV	GO to PINPOINT TEST HA: NATURAL GAS FUEL CONTROL Step 52.	GO to PINPOINT TEST HA: NATURAL GAS FUEL CONTROL Step 52	GO to PINPOINT TEST HA: NATURAL GAS FUEL CONTROL Step 52.
All others	-	GO to PINPOINT TEST H: FUEL CONTROL Step 69.	-