What does code P1133 mean on Isuzu vehicles?
The oxygen sensor on bank 1 sensor 1 is not switching properly between rich and lean conditions.
OBD-II Code Isuzu
P1133 — Isuzu — HO2S Insufficient Switching Bank 1 Sensor 1
The oxygen sensor on bank 1 sensor 1 is not switching properly between rich and lean conditions.
Common symptoms
- Check engine light on
Possible causes
- Aged or contaminated oxygen sensor
Initial recommendation
Replace the upstream oxygen sensor (B1S1) and verify 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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