P2188 KIA - System Too Rich At Idle Bank 1

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

  • Leaking fuel injector or pressure regulator
  • High fuel pressure condition
  • Leak in exhaust system
  • Faulty Oxygen (O2) Sensor
  • Faulty Mass Air Flow (MAF) sensor

Tech notes

There is a factory service bulletin for the following Kia models:
2012-2013 Kia Rio
2012-2013 Kia Soul
The Factory Service Bulletin recommends reprogramming the Engine Control Module (ECM) to fix the problem.

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P2188 Kia Description

In order to provide the best possible combination of driveability, fuel economy and emission control, the PCM uses a closed loop air/fuel metering system. The PCM monitors the HO2S signal voltage and adjusts fuel delivery based it in closed loop fuel control. Changes in fuel delivery will be indicated by the long-term and the short-term fuel trim values. The ideal fuel trim value is around 0%. The PCM will add fuel when the HO2S signal is indicating a lean condition. Additional fuel is indicated by fuel trim values that are above 0%. The PCM will reduce fuel when the HO2S signal is indicating a rich condition. Reduction in fuel is indicated by fuel trim values that are below 0%. The DTC relevant to fuel trim will be set when the amount reaches excessive levels because of a lean or rich condition.
OBDII Code P2188 Kia - System Too Rich At Idle Bank 1 - AutoCodes.com

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