Which diagnostic trouble code is associated with a "System Too Lean" condition?

The diagnostic trouble code P0171 is specifically associated with a "System Too Lean" condition in the engine management system. This code indicates that the engine control module (ECM) has detected that the air-fuel mixture is too lean, meaning there is an excess of air compared to fuel. This condition can lead to poor engine performance, increased emissions, and potential damage to components if not addressed.

A "System Too Lean" condition can arise from various issues, such as a vacuum leak, a malfunctioning mass airflow sensor (MAF), clogged fuel injectors, or a weak fuel pump. When the system is lean, the ECM tries to compensate for the lack of fuel by adjusting the fuel trim, which can lead to additional complications if prolonged.

Understanding this code is crucial for smog repair technicians, as addressing a lean condition is integral to ensuring that a vehicle can pass emissions testing and operate efficiently.