What does code P1166 mean on Audi vehicles?
A persistent rich condition on Bank 1 has exceeded the long-term fuel trim rich limit for range 2.
OBD-II Code Audi
P1166 — Audi — Bank 1 Long Term Fuel Trim Range 2 Rich Limit Exceeded
A persistent rich condition on Bank 1 has exceeded the long-term fuel trim rich limit for range 2.
Common symptoms
- Check engine light illuminated.
Possible causes
- Faulty fuel injectors.
Initial recommendation
Check the fuel injection system.
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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