How to Change an Engine Air Filter

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Here's how to change the engine air filter in a Toyota or Lexus vehicle.

This will apply to most Toyota vehicles from around 2001 to 2007, with models including the Camry, Highlander, Sienna, Avalon, Solara, the Lexus ES300, ES330, RX300 and RX330 with V6 engines.

The engine air filter is responsible for filtering the air coming from the air intake below the vehicle, before it enters the engine at the throttle body. A clogged air filter will cause bad fuel economy and poor engine performance, not to mention the danger of letting crap into your engine.

Using a paper filter is recommended, since performance filters (such as those from K&N) have to be periodically oiled in order to filter properly. This oil can contaminate the mass air flow sensor and throttle body.

There are two 10mm bolts that hold the air box cover down. Once those are loosened (it doesn't have to be removed), the air filter can be slipped out from underneath.

However, if the air-box is dirty, its best to remove it completely and vacuum the crud out from the bottom of the airbox. To do that, disconnect the mass-air-flow sensor and loosen the hose clamp with a 10mm socket.

Once the air box has been cleaned, replace the air filter with a new one and make sure the air box fits tightly to avoid vacuum leaks.


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