P2187

System Too Lean at Idle (Bank 1)

Q: What does fault code P2187 mean?

System Too Lean at Idle (Bank 1). BMW-specific lean condition mainly at idle. Vacuum leaks and CCV/DISA related issues common.

Q: What are the symptoms of P2187?

CEL; Rough idle; Possible misfire at idle

Q: What are the possible causes of P2187?

Vacuum leaks (boots, PCV, booster); Faulty CCV; MAF; Fuel pressure; Injectors

Q: How to fix P2187?

Smoke-test intake; Inspect all vacuum lines and boots; Check CCV; Monitor trims at idle vs cruise

Severity: Medium Fuel & Air Metering BMW Specific Est. Repair: $150 - $600

Schedule diagnosis soon. Continued driving may worsen the issue.

What Does P2187 Mean?

BMW-specific lean condition mainly at idle. Vacuum leaks and CCV/DISA related issues common.

Common Symptoms

CEL

Rough idle

Possible misfire at idle

Possible Causes

Vacuum leaks (boots, PCV, booster)

Faulty CCV

MAF

Fuel pressure

Injectors

How to Fix P2187 – Repair Guide

Smoke-test intake

Inspect all vacuum lines and boots

Check CCV

Monitor trims at idle vs cruise

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Disclaimer: Information is for educational reference only and does not replace professional diagnosis. Actual causes and costs vary by vehicle make, model, year and condition. Always verify with a qualified technician.