What does code P1321 mean on Audi vehicles?
Low signal detected from knock sensor 3.
OBD-II Code Audi
P1321 — Audi — Knock Sensor 3 Circuit Low Input
Low signal detected from knock sensor 3.
Common symptoms
- Reduced engine performance.
Possible causes
- Faulty knock sensor.
Initial recommendation
Inspect knock sensor 3.
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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