p2187
Moderate
BMW · SUVs
System Too Lean at Idle Bank 1
Quick Answer
Error code P2187 on your BMW 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
Likely Causes
How to Fix It
1
Monitor bank 1 fuel trims at idle with a scan tool
2
Perform a smoke test to locate vacuum leaks around the intake and injectors
3
Clean the throttle body and inspect idle control system
4
Inspect and replace fuel injector O-rings if cracked or leaking
5
Check PCV valve and oil separator for proper function
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
Fuel injector O-rings
PCV valve
Oil separator (CCV)
MAF sensor
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