What does code P1173 mean on Mazda vehicles?
The oxygen sensor signal on bank 2 sensor 1 is fixed and not responding to mixture changes.
OBD-II Code Mazda
P1173 — Mazda — HO2S Bank 2 Sensor 1 Circuit Fixed (Bank 2 Sensor 1)
The oxygen sensor signal on bank 2 sensor 1 is fixed and not responding to mixture changes.
Common symptoms
- Emissions issues
- check engine light
Possible causes
- Oxygen sensor failure
Initial recommendation
Replace oxygen sensor and verify correct operation.
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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