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p2187
Moderate
BMW · Sedans
System Too Lean at Idle Bank 1
Quick Answer
Error code P2187 on your BMW 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
330i530i540i740i760i330e 2024330i xDrive 2024530i 2024530i xDrive 2024540i xDrive 2024545e xDrive 2024740i 2024740i xDrive 2024760i xDrive 2024M3 CS 2024M3 Competition 2024M3 Competition xDrive 2024M340i xDrive 2024i4 M50 2024i4 eDrive35 2024i4 eDrive40 2024M3M340ii4i5
Likely Causes
  1. Vacuum leak at idle affecting bank 1
  2. Faulty idle air control valve or throttle body
  3. Dirty or failed MAF sensor
  4. Leaking fuel injector O-rings on bank 1
  5. PCV system malfunction
How to Fix It
1
Monitor fuel trims at idle with a scan tool to confirm lean condition
2
Perform a smoke test to locate vacuum leaks around the intake and injectors
3
Clean the throttle body and inspect the idle air control system
4
Inspect and replace fuel injector O-rings if leaking
5
Check PCV valve and associated hoses 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
MAF sensor
Throttle body gasket
Related Error Codes
P0171P0174P0300P0335P0340
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