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P0174OBD-II Code

Understanding Code P0174: System Too Lean (Bank 2)

Code P0174 indicates that the engine control module has detected a lean condition in bank 2 of the engine. This article explores the common causes and implications of this diagnostic trouble code.

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Diagnostic Guide
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Diagnostic Information

When the engine control module (ECM) detects that the air-fuel mixture is too lean on bank 2, it triggers code P0174. This condition can lead to performance issues and increased emissions. Common causes of this code include a vacuum leak on the bank 2 side of the intake system, a dirty or failing mass airflow sensor, a weak fuel pump affecting both banks, clogged fuel injectors on bank 2, or a faulty bank 2 oxygen sensor. Identifying the root cause is crucial for effective diagnosis and resolution.

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