P0174: System Too Lean (Bank 2)
System: Fuel trim · Priority: medium
What P0174 means
The control module detected a condition matching the generic definition System Too Lean (Bank 2). A trouble code identifies what the module detected; it does not automatically identify the failed part.
Useful next checks
- Inspect for vacuum or intake leaks affecting Bank 2 or both banks.
- Check fuel pressure and MAF readings.
- Compare fuel trims between banks with live data.
Why vehicle context matters
The same generic code can have different diagnostic paths depending on engine, calibration, wiring layout, service bulletins and related codes. Freeze-frame and live data can help establish when the fault occurred.
Need a scanner for P0174?
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