Small vacuum leak (PCV, brake booster, intake gasket). Faulty fuel pressure at idle. Dirty or failing MAF sensor. Cracked intake boot. Worn injector seals (direct injection).

Which cars are affected by P2187?

P2187 is most commonly reported on Volkswagen, Audi, BMW, Volvo, Ford vehicles, but can appear on any make.

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P2187

Medium severity

System Too Lean at Idle (Bank 1)

The fuel trim correction at idle indicates a lean condition on bank 1. Unlike P0171 which covers all operating conditions, this code specifically triggers only at idle speed.

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Common causes of P2187

1Small vacuum leak (PCV, brake booster, intake gasket)

2Faulty fuel pressure at idle

3Dirty or failing MAF sensor

+2 more causes

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Commonly affected vehicles

VolkswagenAudiBMWVolvoFord

P2187 can appear on any vehicle — these are the makes where it is most frequently reported.

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Related fault codes

P0171Medium

System Too Lean (Bank 1)

P0300High

Random/Multiple Cylinder Misfire Detected

P0420Medium

Catalyst System Efficiency Below Threshold (Bank 1)

P0172Medium

System Too Rich (Bank 1)