2005-2009 Audi A4 Engine Air Filter Box - (UPPER HALF) 03G133837

This OEM Engine Air Filter Box (Upper Half), part number 03G133837, serves as a critical component within the air intake system of compatible Audi A4 and A4 Quattro models from 2005 to 2009. Specifically designed for vehicles equipped with the 2.0L L4 gas engine, it ensures optimal airflow to the engine while effectively filtering out contaminants. This air cleaner assembly, also referred to as the air filter and housing assembly, plays a crucial role in maintaining engine performance by preventing dust and debris from entering the engine combustion chamber. Common issues such as reduced engine power and increased fuel consumption may arise from a worn or damaged filter box, making this authentic OEM part essential for restoring functionality. Compatible with alternative part numbers 038133837Q, 038133837J, and 038133837C, this upper air filter box is a genuine piece sourced directly from salvage vehicles, ensuring reliable quality and fitment.