What does System Too Lean Bank 1 mean?

[McMaci]

System Too Lean Bank 1 refers to incomplete combustion in the fuel system. Here are the reasons for System Too Lean Bank 1: 1. Carbon deposits: Caused by insufficient fuel injection, check if there are any issues with fuel pressure, as carbon deposits may be excessive. 2. Air-fuel mixture: The fuel measurement system usually indicates either a too lean or too rich air-fuel mixture. If the mixture is too lean, clean the intake tract carbon deposits and replace the gasoline filter element in time. 3. Fuel injector: If the mixture is too rich, check the intake system for leaks. If there are none, then the issue lies with the fuel injector. You can perform a fuel injector atomization test or clean the fuel injector.