What to Do When Audi Cylinder Bank 1 System Is Too Lean at Idle?

[EloiseDella]

Here are the specific causes and solutions for the system being too lean in cylinder bank 1 at idle: 1. Insufficient fuel injection: Solution: Check if there is an issue with the fuel pressure. Excessive carbon buildup may be the cause, in which case simply removing the excess carbon deposits will suffice. 2. If the fuel measurement system reports an issue, it is generally due to the air-fuel mixture being too lean or too rich: Solution: If the mixture is too lean or too rich, clean the carbon deposits in the intake tract, throttle body, and replace the fuel filter. 3. Issues with the fuel injector: Solution: Perform a fuel injector atomization test or clean the fuel injector.