The oil filter on a 2003 Highlander is mounted on the side of the engine block, not in the oil pan. If your Highlander uses the 3.0L V6, look on the front-side of the engine near the timing cover; if it has the 2.4L four-cylinder, it sits on the passenger side of the engine block, often behind the exhaust manifold and accessible from the wheel well.
Engine variants and approximate locations
Toyota offered two engines in the 2003 Highlander. The oil filter’s position depends on which engine you have.
- 3.0L V6 (1MZ-FE): The oil filter is mounted on the front side of the engine block, near the timing cover. It is typically visible from the engine bay and can be accessed from above with basic tools.
- 2.4L I4 (2AZ-FE): The oil filter sits on the passenger side of the engine block, often behind parts of the exhaust manifold or near the firewall. Access is usually via the wheel well after removing the splash shield.
If you’re unsure which engine is in your Highlander, check the engine code stamped on the block or consult the owner’s manual or a repair guide for your VIN.
Access tips and safety
To physically locate and replace the filter, follow these steps to access it safely.
- Park on level ground, engage the parking brake, and place wheel chocks behind the rear wheels. If you must lift the vehicle, use a floor jack and secure with jack stands.
- If needed, remove the wheel or inner fender splash shield to gain a clear view of the engine side where the filter sits.
- Position a drain pan under the oil pan and locate the oil filter on the engine block. Use the appropriate filter wrench to loosen it counterclockwise.
- Remove the old filter, letting any residual oil drain into the pan. Wipe the mounting surface clean and inspect for any gasket or debris.
- Install the new filter, hand-tightening first and then giving it an additional 3/4 to 1 full turn (or as specified by the filter manufacturer). If using a cartridge-type filter, replace its O-rings and follow the manufacturer’s retro-fit instructions.
- Refill the engine with the correct grade and amount of oil, then start the engine and check for leaks. Recheck the oil level after the engine runs to operating temperature.
When in doubt, consult the service manual for your exact engine code or seek help from a qualified technician to avoid over-tightening or cross-threading the filter.
Tools and parts you may need
Having the right equipment on hand makes the job smoother and safer.
- New oil filter compatible with your engine (and replacement O-ring if cartridge-type)
- Correct grade and amount of engine oil
- Oil filter wrench (spin-on or cartridge adaptor, as applicable)
- Drain pan, funnels, and rags for cleanup
- Socket set, pliers, and possibly a jack and jack stands
Preparing the right tools in advance helps ensure a clean, safe, and efficient oil change.
Summary
The 2003 Highlander’s oil filter is not inside the oil pan; it sits on the engine side and varies by engine choice. The V6 (1MZ-FE) places the filter on the front side of the engine block near the timing cover, while the 4-cylinder (2AZ-FE) places it on the passenger side, often behind the exhaust manifold. By identifying your engine code and following proper safety steps, you can locate and replace the filter with the correct tools and oil.