What causes the system to be too lean at idle in cylinder bank 1?

[RubyRose]

The reasons for the system being too lean at idle in cylinder bank 1: 1. Insufficient fuel injection, check if there is any issue with fuel pressure, carbon deposits may be excessive; 2. A fuel measurement system alert generally indicates the air-fuel mixture is either too lean or too rich. If the mixture is too lean, it requires cleaning intake tract carbon deposits, throttle body, and replacing the fuel filter; 3. If the mixture is too rich, check the intake system for leaks. If no leaks are found, perform a fuel injector atomization test or clean the fuel injectors. The system being too lean at idle in cylinder bank 1 means the air-fuel mixture in one bank of the engine is too lean. To diagnose a lean mixture, check: 1. Fuel injector atomization; 2. The electronic control system; 3. Whether the engine's intake pressure sensor is faulty; 4. Whether the intake manifold is leaking.