What does code P1158 mean on BMW vehicles?
The additive fuel trim on bank 1 is lower than expected, indicating a lean correction condition.
OBD-II Code BMW
P1158 — BMW — Fuel Trim Additive Bank 1 Too Low
The additive fuel trim on bank 1 is lower than expected, indicating a lean correction condition.
Common symptoms
- Loss of power
- poor engine response
Possible causes
- Vacuum leaks
- unmetered air
Initial recommendation
Inspect intake system for vacuum leaks and verify fuel trim values.
Safety notice
This information is for guidance only. Brand-specific codes may vary by model, year, engine, transmission and vehicle configuration. It does not replace a physical inspection or diagnosis by a qualified mechanic. If the vehicle is unsafe to operate, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
Use the app to combine BMW code P1158 with your vehicle's actual symptoms for more complete diagnostic guidance.
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