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BMW P0174 Code – System Too Lean Bank 2
Limited
Safe to drive :
BMW vehicles only
Applies only to :
Not applicable to :
This explanation does NOT apply to other manufacturers.
Medium
Severity level :
When Does This Code Appear on the Vehicles
BMW P0174 often appears together with P0171 and indicates lean operation on Bank 2.
What This Code means on the Vehicles
On BMW vehicles, P0174 indicates Bank 2 fuel mixture exceeds lean correction limits.
Why This is different from a generic OBD2 Code
BMW intake systems frequently leak downstream of the MAF, affecting both banks.
Common Situations That Trigger This Code
Intake boot cracks; CCV failure; Vacuum leaks.
What Will NOT Fix This Code
Replacing injectors without confirming airflow issues.
How to Clear This Code on Vehicles
Smoke test intake system and repair leaks before clearing code.
Related Manufacturer Specific Codes
BMW P0171; BMW P1131
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