P2187 AUDI - System Too Lean At Idle Bank 1

Repair Importance Level: 3/3

Repair Difficulty Level: 3/3

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Possible causes

Intake air leaks

Faulty front heated oxygen sensor

Ignition misfiring

Faulty fuel injectors

Incorrect fuel pressure

Lack of fuel

Faulty Mass Air Flow (MAF) sensor

Incorrect Positive Crankcase Ventilation (PCV) hose connection

What does this mean?

Tech notes

User Submitted Video

What does this mean?

Possible symptoms

Engine Light ON (or Service Engine Soon Warning Light)

Hard to start engine when cold

P2187 Audi Description

In order to provide the best possible combination of drivability, fuel economy and emission control, the Powertrain Control Module (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 P2187 Audi - System Too Lean At Idle Bank 1 - AutoCodes.com

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