What does code P1131 mean on Mazda vehicles?
The oxygen sensor signal indicates a lean air-fuel mixture condition.
OBD-II Code Mazda
P1131 — Mazda — HO2S Bank 1 Sensor 1 Signal Below 0.45V (A/F Ratio Too Lean)
The oxygen sensor signal indicates a lean air-fuel mixture condition.
Common symptoms
- Loss of power
- hesitation
Possible causes
- Vacuum leak
- faulty oxygen sensor
Initial recommendation
Inspect intake system for vacuum leaks and test oxygen sensor.
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 Mazda code P1131 with your vehicle's actual symptoms for more complete diagnostic guidance.
Go to the app View more brands