p2187
Moderate
Volkswagen · Sedans
System Too Lean at Idle Bank 1
Quick Answer
Error code P2187 on your Volkswagen 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
Likely Causes
How to Fix It
1
Monitor short-term and long-term fuel trims at idle using a scan tool; high positive values confirm lean condition
2
Use a smoke machine to identify vacuum leaks in the intake system, PCV system, and brake booster line
3
Clean the MAF sensor with MAF cleaner and recheck fuel trim values
4
Test fuel pressure at idle and compare to factory specification
5
Inspect and replace any cracked intake boots, vacuum hoses, or gaskets found during testing
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
MAF sensor
Intake manifold gasket
Vacuum hoses
Fuel pressure regulator
PCV valve and hoses
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