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p2187
Moderate
Audi · Sedans
System Too Lean at Idle (Bank 1)
Quick Answer
Error code P2187 on your Audi Sedans means: System Too Lean at Idle (Bank 1). This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
8YB9F5C8D5FW
Likely Causes
  1. Small vacuum leak detectable primarily at idle
  2. Faulty PCV valve or crankcase ventilation system leak
  3. Dirty or failing fuel injectors not atomizing properly at low flow
  4. Intake manifold gasket leak
  5. Faulty fuel pressure regulator not maintaining idle pressure
How to Fix It
1
Perform a thorough smoke test of the intake and crankcase ventilation system
2
Inspect PCV valve and all associated hoses for cracks or disconnections
3
Check fuel trim data at idle versus higher RPMs to isolate the lean condition
4
Test fuel injector spray pattern and flow rate
5
Inspect the fuel pressure regulator for proper idle fuel pressure
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
PCV valve
Vacuum hoses
Intake manifold gasket
Fuel injectors
Related Error Codes
P0171P0174P0300P0420P0411
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