What does code P2189 mean?

Q: What does code P2189 mean?

System Too Lean at Idle (Bank 2). P2189 indicates that the engine computer has detected a lean fuel condition on bank 2 specifically while the engine is idling, meaning the air-fuel mixture has too much air and not enough fuel. The powertrain control module sets this code when the bank 2 oxygen sensor reports a lean exhaust stream that it cannot correct by adding fuel, and the fault is present only at idle, not at higher engine speeds.

DTC codes / P21xx · Fuel and air metering / P2189

P2189System Too Lean at Idle (Bank 2)

P2189 indicates that the engine computer has detected a lean fuel condition on bank 2 specifically while the engine is idling, meaning the air-fuel mixture has too much air and not enough fuel. The powertrain control module sets this code when the bank 2 oxygen sensor reports a lean exhaust stream that it cannot correct by adding fuel, and the fault is present only at idle, not at higher engine speeds.

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.