P2187 Fault Code

System Too Lean at Idle Bank 1

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2187 fault code indicates that the Engine Control Module (ECM) has detected a lean condition in the air-fuel mixture for Bank 1 at idle. This means that there is too much air and not enough fuel entering the engine when it's idling. A lean condition can lead to performance issues and can potentially harm engine components if not addressed.

What are the symptoms of the P2187 code?

Drivers may experience various symptoms related to a lean condition at idle, such as:

• Rough idling or engine stalling.
• Increased engine RPMs at idle.
• Reduced engine power and acceleration.
• Poor fuel economy.
• Check Engine Light (CEL) illumination on the dashboard.

What causes the P2187 code?

Several factors can contribute to the P2187 code, including:

• A vacuum leak in the intake system.
• Faulty fuel injectors that are not delivering sufficient fuel.
• A malfunctioning mass air flow (MAF) sensor.
• Clogged fuel filters or a failing fuel pump.
• Incorrectly adjusted fuel pressure or engine timing problems.
• Exhaust leaks that affect air sensors.

How to fix P2187?

To resolve the P2187 code, a comprehensive diagnostic is recommended. Suggested steps include:

• Inspecting the intake system for vacuum leaks and repairing them if found.
• Testing fuel injectors for proper function and replacing any faulty injectors.
• Checking the MAF sensor for accurate readings and cleaning or replacing it if necessary.
• Examining fuel lines, filters, and pumps to ensure proper fuel delivery.
• Resetting the ECM after repairs and monitoring for the code to reappear.