What are the common sensor failures in Audi vehicles?

[MiguelDella]

Audi vehicle sensor failures include mass air flow sensor failure, coolant temperature sensor failure, and front oxygen sensor failure. Specific failures are as follows: Mass Air Flow Sensor Failure: If the mass air flow sensor or its circuit malfunctions, the ECU cannot receive accurate intake air volume signals, resulting in either excessively rich or lean air-fuel mixtures. This leads to incomplete combustion, causing unstable engine idle, increased fuel consumption, poor acceleration, and worsened exhaust emissions. Coolant Temperature Sensor Failure: If the coolant temperature sensor fails or its circuit has issues, the ECU cannot obtain correct coolant temperature signals, making precise fuel injection control impossible. This often results in difficult cold starts, acceleration problems, and severe vibrations during cold starts. Front Oxygen Sensor Failure: If the front oxygen sensor fails, the ECU cannot precisely control the air-fuel ratio, leading to various symptoms of incomplete combustion such as unstable idle, misfires, and surging vibrations.