HomeBrandsAudiSUVsp2181
p2181
Moderate
Audi · SUVs
Cooling System Performance
Quick Answer
Error code P2181 on your Audi SUVs means: Cooling System Performance. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
F3FY4M4MNGENGE
Likely Causes
  1. Thermostat stuck open or intermittently failing
  2. Faulty engine coolant temperature sensor
  3. Low coolant level from a slow leak
  4. Air pocket in the cooling system
  5. Water pump impeller worn or slipping
How to Fix It
1
Inspect coolant level and check for visible leaks at hoses, radiator, and water pump
2
Monitor coolant temperature with a scan tool during engine warm-up cycle
3
Verify thermostat opens at the correct temperature by comparing scan data to spec
4
Bleed the cooling system to remove any trapped air
5
Replace the thermostat if the engine consistently fails to reach operating temperature
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Thermostat
Coolant temperature sensor
Coolant
Thermostat housing gasket
Related Error Codes
P0171P0174P0300P0302P0420
Video Guides
Loading video guides…
Search more on YouTube →