P1128 - Upstream Oxygen Sensors Swapped From Bank To Bank (Ho2S-11-21)
P1128 - 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: |
|
||
| Diagnostic Aids: | - | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| Dedicated NGV | - | GO to HA: Natural Gas Fuel Control STEP HA50 | - |
| All Others | - | GO to H: Fuel Control STEP H69 | - |