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Ford P1151 Code – Lack of HO2S Switch Lean Bank 2
Limited
Safe to drive :
Ford vehicles only
Applies only to :
Not applicable to :
This explanation does NOT apply to Toyota, BMW, GM, VW, or other manufacturers.
Medium
Severity level :
When Does This Code Appear on the Vehicles
Ford P1151 affects Bank 2 fuel control and is commonly paired with P1131.
What This Code means on the Vehicles
On Ford vehicles, P1151 indicates the upstream oxygen sensor on Bank 2 fails to indicate rich.
Why This is different from a generic OBD2 Code
Ford PCM logic uses this code to monitor fuel control effectiveness.
Common Situations That Trigger This Code
Intake leaks; Exhaust leaks; Low fuel pressure.
What Will NOT Fix This Code
Replacing PCM; Replacing downstream oxygen sensors.
How to Clear This Code on Vehicles
Correct lean conditions, verify fuel pressure, clear code.
Related Manufacturer Specific Codes
Ford P1131; Ford P0174
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