What does code P1129 mean on Volkswagen vehicles?
The ECU detects a rich long-term fuel trim condition on bank 2.
OBD-II Code Volkswagen
P1129 — Volkswagen — Long Term Fuel Trim Bank 2 System Too Rich
The ECU detects a rich long-term fuel trim condition on bank 2.
Common symptoms
- Check engine light
- increased fuel consumption
Possible causes
- Faulty injectors
- oxygen sensor bias
- fuel pressure issues
Initial recommendation
Inspect fuel injectors and sensor data, and perform mixture diagnostics.
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 Volkswagen code P1129 with your vehicle's actual symptoms for more complete diagnostic guidance.
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