What does code P1142 mean on Mazda vehicles?
The oxygen sensor heater circuit voltage is higher than expected.
OBD-II Code Mazda
P1142 — Mazda — HO2S Bank 1 Sensor 2 Heater Circuit High Input
The oxygen sensor heater circuit voltage is higher than expected.
Common symptoms
- Check engine light
Possible causes
- Open circuit
- wiring fault
Initial recommendation
Check heater circuit for open connections and repair as needed.
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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