What does code P0139 mean on Land Rover vehicles?
The ECU detects a slow response from the downstream oxygen sensor.
OBD-II Code Land Rover
P0139 — Land Rover — Oxygen Sensor Downstream Slow Response
The ECU detects a slow response from the downstream oxygen sensor.
Common symptoms
- Reduced catalyst efficiency
Possible causes
- Aged or contaminated downstream oxygen sensor
Initial recommendation
Inspect downstream oxygen sensor response and replace if sluggish.
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
Use the app to combine Land Rover code P0139 with your vehicle's actual symptoms for more complete diagnostic guidance.
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