DTC Descriptors: Notes
This diagnostic procedure supports the following DTCs:
- DTC P0171 HO2S Fuel Trim System Lean Bank 1
- DTC P0174 HO2S Fuel Trim System Lean Bank 2
DTC P0171 or P0174
| HO2S Indication | Short Term FT Action | Long Term FT Action | Short Term FT Response |
|---|---|---|---|
| Lean Condition | Quick Increase of 1% or More | Slow Increase of 1% or More | Return to 0% |
| Desired Condition | Stays Near 0% | Stays at Learned +/- Value | Stays Near 0% |
| Rich Condition | Quick Decrease of -1% or Less | Slow Decrease of -1% or Less | Return to 0% |