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p2188
Moderate
Volkswagen · SUVs
System Too Rich at Idle Bank 1
Quick Answer
Error code P2188 on your Volkswagen SUVs 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
CAID4ID6B25N5N-LWBCRAtlas Cross Sport SE 2024Atlas Cross Sport SEL 2024Atlas Cross Sport SEL R-Line 2024Atlas SE 2024Atlas SEL 2024Atlas SEL Premium R-Line 2024ID.4 Pro 2024ID.4 Pro S 2024ID.4 Pro S Plus 2024ID.4 Standard 2024Taos S 2024Taos SE 2024Taos SEL 2024Tiguan S 2024Tiguan SE 2024Tiguan SEL 2024Tiguan SEL R-Line 2024
Likely Causes
  1. Leaking fuel injector dripping fuel at idle
  2. Faulty fuel pressure regulator holding pressure too high
  3. Saturated charcoal canister purging excessive fuel vapors
  4. Faulty MAF sensor over-reporting airflow causing excess fueling
  5. Stuck-open EVAP purge valve flooding the intake with fuel vapor
How to Fix It
1
Monitor short-term and long-term fuel trims at idle; high negative values confirm a rich condition
2
Check fuel pressure at idle with a fuel pressure gauge; compare to factory specification
3
Inspect fuel injectors for external leaks and test each injector for proper shut-off using a noid light or balance test
4
Disconnect the EVAP purge valve hose and check if fuel trims normalize, indicating a stuck-open purge valve
5
Test the MAF sensor readings against factory specifications and replace if out of range
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
EVAP purge valve (N80)
MAF sensor
Charcoal canister
Related Error Codes
P0171P0300P0301P0420P0411
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