Error Code P2187
Moderate Issue
DTC Code P2187 indicates a System Too Lean At Idle condition on Bank 1, where the Powertrain Control Module (PCM) detects an excessively lean air/fuel mixture during idle, as indicated by the long-term and short-term fuel trim values.
What symptoms indicate Error Code P2187?
- Engine Light ON: The check engine light or service engine soon warning light is illuminated, indicating a potential issue with the air-fuel mixture at idle.
- Hard to Start Engine When Cold: The engine may be difficult to start when cold, which can be linked to a lean air-fuel mixture at idle, affecting combustion efficiency.
What causes OBD code Error Code P2187?
- Intake air leaks can allow unmetered air to enter the engine, causing a lean condition at idle.
- A faulty front heated oxygen sensor may provide incorrect data to the engine control module, leading to improper fuel mixture adjustments.
- Ignition misfiring can result in incomplete combustion, affecting the air-fuel ratio.
- Faulty fuel injectors may not deliver the correct amount of fuel, causing a lean mixture.
- Incorrect fuel pressure can lead to insufficient fuel delivery, resulting in a lean condition.
- A lack of fuel can cause the engine to run lean, especially noticeable at idle.
- A faulty Mass Air Flow (MAF) sensor may inaccurately measure the air entering the engine, affecting fuel calculations.
- Incorrect Positive Crankcase Ventilation (PCV) hose connection can lead to unmetered air entering the intake system.
How to fix OBD code Error Code P2187?
- Initial Test Drive and Observation: Conduct a test drive to observe any symptoms. Use a code scanner to pull additional codes. If no symptoms are present, consider the possibility of a false code due to computer or oxygen sensor issues.
- Check Fuel Cap and Oil Filler Cap: Inspect the fuel cap for cracks and ensure it seals properly. Verify that the oil filler cap is tight.
- Inspect for Air Leaks: Examine the mass airflow sensor and connections to the intake manifold for cracks or loose connections. Check all vacuum hoses, including those to the vacuum brake booster, MAP sensor, and turbo if applicable.
- Spray Test for Intake Manifold Leaks: With the engine running, spray carburetor cleaner around the intake manifold base and EGR base. An increase in RPM indicates a leak.
- Check PCV Valve and Hoses: Inspect the PCV valve and associated hoses for any leaks.
- Inspect Fuel System Components: Check fuel injectors for external leaks. Inspect the fuel pressure regulator by removing the vacuum hose and checking for fuel presence.
- Fuel Pressure Test: Install a fuel pressure tester on the schrader valve. Measure fuel pressure at idle and at 2500 rpm. Compare with the vehicle's specifications and replace the pump or filter if out of range.