What is code p2177 on 2007 Mazda 3 2.0 engine?

Code P2177 on a 2007 Mazda 3 with a 2.0 engine indicates a problem with the air-fuel mixture, specifically that the system is running too lean during idle conditions. This can be caused by issues such as a vacuum leak, a malfunctioning mass air flow sensor, or problems with the fuel delivery system. It's important to diagnose the underlying cause to ensure proper engine performance and emissions compliance.