What does code P1177 mean on Volkswagen vehicles?
The ECU has reached the correction limit for the post-catalyst oxygen sensor on bank 1.
OBD-II Code Volkswagen
P1177 — Volkswagen — Oxygen Sensor Correction Behind Catalyst Bank 1 Limit Attained
The ECU has reached the correction limit for the post-catalyst oxygen sensor on bank 1.
Common symptoms
- Check engine light
Possible causes
- Catalytic converter efficiency issues
- rear O2 sensor degradation
Initial recommendation
Inspect catalytic converter efficiency and test rear 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.
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