What does code P1143 mean on Mazda vehicles?
The oxygen sensor on bank 1 sensor 3 indicates a lean exhaust condition.
OBD-II Code Mazda
P1143 — Mazda — HO2S Bank 1 Sensor 3 Signal Below 0.45V (A/F Ratio Too Lean)
The oxygen sensor on bank 1 sensor 3 indicates a lean exhaust condition.
Common symptoms
- Reduced engine performance
Possible causes
- Faulty oxygen sensor
- exhaust leak
Initial recommendation
Test oxygen sensor and inspect exhaust system.
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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