What does code P1621 mean on Audi vehicles?
The engine coolant temperature signal is shorted to ground.
OBD-II Code Audi
P1621 — Audi — Engine Coolant Temperature Signal Short to Ground
The engine coolant temperature signal is shorted to ground.
Common symptoms
- Incorrect temperature readings.
Possible causes
- Faulty wiring.
Initial recommendation
Inspect wiring harness.
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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