What does code P2187 mean?

Q: What does code P2187 mean?

System Too Lean at Idle (Bank 1). P2187 means the engine computer has detected a lean condition at idle on bank 1, which is the side of the engine containing cylinder one. The computer calculates that the air-to-fuel mixture is too high in air, so it has added more fuel than expected and still cannot bring the oxygen sensor reading back to the target range.

DTC codes / P21xx · Fuel and air metering / P2187

P2187System Too Lean at Idle (Bank 1)

P2187 means the engine computer has detected a lean condition at idle on bank 1, which is the side of the engine containing cylinder one. The computer calculates that the air-to-fuel mixture is too high in air, so it has added more fuel than expected and still cannot bring the oxygen sensor reading back to the target range.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.