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p2187
Moderate
Audi · SUVs
System Too Lean at Idle (Bank 1)
Quick Answer
Error code P2187 on your Audi SUVs 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
F3FY4M4MNGENGE
Likely Causes
  1. Small vacuum leak only apparent at idle
  2. Failing PCV valve or crankcase ventilation leak
  3. Fuel injectors not delivering enough fuel at low pulse widths
  4. Intake manifold gasket seeping at idle vacuum
  5. Fuel pressure regulator not maintaining proper idle pressure
How to Fix It
1
Perform a smoke test focusing on intake and crankcase ventilation system
2
Inspect the PCV valve and all associated hoses for cracks or disconnections
3
Compare fuel trim values at idle versus 2500 RPM to isolate the lean condition
4
Test fuel injector balance and spray pattern at idle flow rates
5
Check fuel pressure regulator operation at idle
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
P0171P0174P0300P0302P0420
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