Question 1

What does P2187 mean?

Accepted Answer

P2187 - System Too Lean at Idle (Bank 1). The engine is running lean specifically at idle on bank 1. Different from P0171 in that it only occurs at idle, not at all RPMs.

Question 2

What are the symptoms of P2187?

Accepted Answer

Check engine light, Rough idle, Idle may be slightly higher or lower than normal

Question 3

What causes P2187?

Accepted Answer

Small vacuum leak (most common at idle), PCV valve leaking, Dirty fuel injectors, Faulty EVAP purge valve, Intake gasket leak

Question 4

How much does it cost to fix P2187?

Accepted Answer

Typical repair cost: $50-$500. A lean-at-idle code is a strong indicator of a vacuum leak. The leak is small enough that it only matters at idle when airflow is low. Check PCV valve, brake booster hose, and intake gaskets.

P2187 — System Too Lean at Idle (Bank 1)

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Common symptoms of P2187

Common causes of P2187

Repair cost & difficulty

Vehicles commonly affected

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