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OBD Code P2187

System Too Lean at Idle (Bank 1)

CodeP2187
DescriptionSystem Too Lean at Idle (Bank 1)
Possible CausesVacuum leak; PCV valve; Intake gasket leak
SymptomsRough idle; Lean misfire at idle
SystemFuel System

What Does P2187 Mean?

System Too Lean at Idle (Bank 1). This diagnostic trouble code (DTC) is stored when the vehicle's onboard computer detects an issue with the fuel system.

Code Breakdown

P = Powertrain code

2 = Manufacturer-specific

How to Fix P2187

Follow these diagnostic steps to identify and resolve the issue. Always start with the simplest checks before moving to more involved repairs.

  1. Check for vacuum leaks — spray carburetor cleaner around intake gaskets and hoses while monitoring short-term fuel trim.
  2. Inspect the MAF sensor for contamination and clean if needed.
  3. Check the PCV valve for proper operation.
  4. Inspect O2 sensors for proper switching between rich and lean.
  5. Check fuel pressure to rule out a weak pump or bad regulator.
  6. Look for exhaust leaks upstream of the first O2 sensor.
  7. Clear codes and monitor fuel trims during a test drive — they should stay within ±10%.

Note: These are general diagnostic guidelines. Some vehicles may have model-specific procedures. Always consult your vehicle's service manual for exact specifications and torque values. If you are not comfortable performing these steps, visit a qualified mechanic.

Frequently Asked Questions

Is P2187 serious?

The severity depends on the underlying cause. Some triggers for P2187 are minor (like a loose gas cap), while others may indicate a more significant problem. We recommend having the code diagnosed with a proper scan tool to determine the exact cause before deciding on urgency.

Can I clear P2187 myself?

You can clear any OBD-II code with a code scanner or by disconnecting the battery for 15-30 minutes. However, clearing the code without fixing the underlying problem will cause it to return — usually within one or two drive cycles. If the code triggered the check engine light, the light will come back on. Fix the root cause first, then clear the code.

How much does it cost to fix P2187?

Repair costs vary widely depending on the root cause. Some fixes are free (like tightening a gas cap) while others can cost several hundred dollars (like replacing a catalytic converter or oxygen sensor). A proper diagnosis with a professional scan tool — not just reading the code — is the first step to getting an accurate repair estimate. Many auto parts stores offer free code reading, but a thorough diagnosis usually requires a mechanic.

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