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p2188
Moderate
BMW · Sedans
System Too Rich at Idle Bank 1
Quick Answer
Error code P2188 on your BMW Sedans means: System Too Rich 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. Leaking fuel injector dripping fuel at idle
  2. Faulty fuel pressure regulator causing high pressure
  3. Contaminated or faulty MAF sensor reading low
  4. Stuck-open purge valve flooding engine with fuel vapors
  5. Faulty upstream oxygen sensor providing incorrect feedback
How to Fix It
1
Check short-term and long-term fuel trims at idle with a scan tool
2
Inspect fuel injectors for leakage using a noid light or leak-down test
3
Test fuel pressure with a gauge and compare to BMW specifications
4
Test EVAP purge valve for stuck-open condition
5
Inspect upstream oxygen sensor operation and heater circuit
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 injectors
Fuel pressure regulator
MAF sensor
EVAP purge valve
Related Error Codes
P0171P0174P0300P0335P0340
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