Lack of HO2S Switch — Sensor Indicates Lean (B1S1) — Ford
This is a manufacturer-specific code used only by Ford vehicles. It's not part of the universal OBD2 standard, so only scanners with ford-specific software can fully diagnose it.
What it means: Lack of HO2S Switch — Sensor Indicates Lean (B1S1)
💡 Tip: Manufacturer codes require a ford-capable scanner or a visit to a dealer/specialty shop. Generic OBD2 scanners won't show you the full details of this code.
This is a reference only. For accurate diagnosis of this ford-specific code, have a technician scan your vehicle.