What does code P1127 mean on Volkswagen vehicles?
The ECU detects that the long-term fuel trim for bank 1 indicates a rich air-fuel mixture over time.
OBD-II Code Volkswagen
P1127 — Volkswagen — Long Term Fuel Trim Bank 1 System Too Rich
The ECU detects that the long-term fuel trim for bank 1 indicates a rich air-fuel mixture over time.
Common symptoms
- High fuel consumption
- fuel smell
- possible rough running
Possible causes
- Faulty fuel injectors
- biased oxygen sensor
- excessive fuel pressure
Initial recommendation
Perform air-fuel mixture diagnostics, check injectors, fuel pressure, and O2 sensor readings.
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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