What does code P1138 mean on Ford vehicles?
The downstream oxygen sensor detects a constant rich condition on bank 1.
OBD-II Code Ford
P1138 — Ford — Downstream O2 Sensor Indicates Rich Bank 1
The downstream oxygen sensor detects a constant rich condition on bank 1.
Common symptoms
- Increased fuel consumption
- high emissions
Possible causes
- Faulty O2 sensor
- damaged or inefficient catalytic converter
Initial recommendation
Inspect downstream O2 sensor operation and check catalytic converter condition.
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
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