The oil filter on the 2006 Lexus RX 400h is located in a cartridge-style housing beneath the engine, on the passenger side, and is accessible from under the vehicle once the front undertray is removed.
This article explains exactly where it sits, how to access it safely, and the steps to replace the filter and oil during a routine maintenance service.
Location and Access
In the RX 400h, the oil filter is not mounted above the engine bay like some cars. It is a cartridge-style element housed in a round canister attached to the engine block on the underside, toward the passenger side near the oil pan. Access is gained by lifting the front of the car, removing the plastic splash shield or undertray, and working from underneath. Always work with the engine cool and the vehicle securely supported.
What you'll need
Before you begin, gather the necessary tools and supplies. The exact oil grade and capacity should be confirmed in the owner’s manual, and you’ll want the correct replacement cartridge filter for the 3.3L V6:
- Replacement cartridge oil filter specific to the 3.3L V6 (OEM or approved aftermarket)
- Correct engine oil grade and quantity (per the owner's manual)
- Oil drain pan
- Oil-filter cap tool or socket compatible with the housing
- Wrench or socket for the engine oil drain plug
- Jack and jack stands or ramps
- Undertray removal tools or a safe method to access beneath the engine
- Rags or shop towels and gloves for cleanliness
Having these items ready helps ensure a smooth replacement. Proper disposal of used oil and the old filter is required at an approved facility.
Steps to replace the oil filter
Follow these general steps to replace the oil filter and refresh the engine oil. If you’re unsure at any point, consult the service manual or a professional mechanic, especially considering the RX 400h’s hybrid layout.
- Safely raise and support the vehicle on a level surface, chock the wheels, and remove the front undertray to gain access to the oil pan and filter housing.
- Place the oil drain pan beneath the oil pan, remove the drain plug, and allow the old oil to drain completely.
- Remove the drain plug and replace the washer if applicable; reinstall and snug to the manufacturer’s specification.
- Locate the oil filter housing cap (round canister) on the underside of the engine, usually toward the passenger side. Use the appropriate tool to loosen and remove the cap.
- Remove the old cartridge filter from the housing, wipe the interior of the housing, and insert a new cartridge filter. Reinstall the cap and torque to the specified value in the manual.
- Reinstall the front undertray, lower the vehicle, and refill the engine with the correct amount and grade of oil. Start the engine and check for leaks, then check the oil level with the dipstick and top up if needed.
After completing these steps, ensure there are no leaks around the filter cap or drain plug and responsibly dispose of the used oil and filter.
Safety and Maintenance Notes
Working under a vehicle carries risk. Always use proper supports and never rely on a jack alone. The RX 400h’s hybrid system adds complexity, so if you’re not comfortable performing this maintenance, seek professional assistance. Regularly verify the oil level after a change and follow Toyota/Lexus recommendations for oil grade and change intervals.
Summary
The 2006 Lexus RX 400h houses its oil filter in a cartridge-style canister mounted to the underside of the engine, on the passenger side near the oil pan. Access requires removing the front undertray and reaching from beneath the vehicle. With the right tools and precautions, you can replace the filter and oil during a routine service, ensuring the hybrid V6 continues to run smoothly and efficiently.