What does code P1157 mean on Ford vehicles?
The downstream oxygen sensor detects a constant lean condition on bank 2.
OBD-II Code Ford
P1157 — Ford — Downstream O2 Sensor Indicates Lean Bank 2
The downstream oxygen sensor detects a constant lean condition on bank 2.
Common symptoms
- Check engine light
- increased emissions
Possible causes
- Faulty downstream O2 sensor
- exhaust system leak
Initial recommendation
Inspect downstream O2 sensor and check exhaust system for leaks.
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.
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