The engine air filter in a 2008 Acura TL is housed in a rectangular black plastic box on the passenger side of the engine bay, connected to a large intake hose that runs to the throttle body.
In this article we explain how to locate the air filter housing, how to open it, how to inspect or replace the filter, and what to check to ensure proper seating and a clean intake path.
Location in the engine bay
The air filter housing sits on the passenger side of the engine compartment, near the firewall. A wide plastic duct from the front grille area feeds air into the box, and a sizable clamp or clip holds the lid in place.
To locate the box quickly, look for a rectangular black plastic container with an oversized hose connected to the throttle body and a secondary duct running toward the front grille.
Note: The intake path may be slightly obscured by other components, but the housing is typically the most obvious black box with a large hose attached.
- Open the hood and ensure the engine is cool; locate the passenger-side area of the engine bay near the firewall.
- Identify the rectangular black air box with a large hose leading to the throttle body.
- Look for metal clips or screws securing the lid of the air box.
With the location confirmed, you’re ready to inspect or replace the air filter.
Replacing the air filter
Replace the engine air filter every 15,000 to 30,000 miles depending on driving conditions; consult the owner's manual for the exact interval. Before you begin, make sure the engine is cool and you have the correct replacement filter for a 2008 TL (typically a standard aftermarket filter compatible with the J-series engine).
To replace the filter, follow these steps:
- Undo the clips or screws on the air box lid to release it. Some models use simple metal clips; others use small Phillips screws.
- Lift the lid and remove the old filter, noting its orientation (the side marked "Top" or with directional arrows goes toward the throttle body).
- Insert the new filter in the same orientation, ensuring it seats evenly in the box without bending or folding.
- Reposition the lid and reseal the housing, re-clamping or re-screwing it securely.
- Reconnect the intake duct and double-check for gaps or loose connections.
- Close the hood and start the engine to confirm smooth operation; you should notice no unusual sounds or air leaks.
Properly replacing the filter helps ensure efficient engine performance and fuel economy.
Summary
The engine air filter in a 2008 Acura TL lives in a rectangular plastic housing on the passenger side of the engine bay, fed by a large intake duct from the grille toward the throttle body. Access the housing by releasing its clips or screws, replace the filter with the correct orientation, and reseal the box. Regular inspection and replacement keep the engine breathing clean air and maintaining performance.