The 2003 Toyota Highlander could be powered by one of two engines: a 2.4-liter four-cylinder or a 3.0-liter V6.
In 2003, the Highlander offered two engine choices depending on trim level. The base models used a 2.4-liter inline-four, while higher trims could be equipped with a 3.0-liter V6. All versions used a four-speed automatic transmission, with all-wheel drive available as an option. A Highlander Hybrid variant did not appear until later years.
Engine options
2.4-liter inline-four (2AZ-FE)
The following details summarize the 2.4-liter engine option available in the 2003 Highlander.
- Displacement: 2.4 L
- Engine code: 2AZ-FE
- Power: roughly 161–164 horsepower
- Torque: around 160–165 lb-ft
- Transmission: 4-speed automatic
- Drivetrain: front-wheel drive standard; all-wheel drive available
In summary, the 2.4-liter four-cylinder provided adequate drivability for front-drive duty or optional all-wheel drive, with modest power compared with the V6 option.
3.0-liter V6 (1MZ-FE)
The following details summarize the 3.0-liter engine option available in the 2003 Highlander.
- Displacement: 3.0 L
- Engine code: 1MZ-FE
- Power: about 220 horsepower
- Torque: around 200–223 lb-ft
- Transmission: 4-speed automatic
- Drivetrain: front-wheel drive or all-wheel drive
In summary, the 3.0-liter V6 offered stronger acceleration and towing capability compared with the four-cylinder, making it the preferred choice for buyers needing more power.
Hybrid version and other notes
For clarity, the 2003 Highlander did not offer a hybrid version. The Highlander Hybrid arrived later, with the first models launching for the 2005–2006 model years, featuring a hybrid powertrain that combined a gasoline engine with electric motors.
Summary
The 2003 Toyota Highlander was available with two engine options: a 2.4-liter inline-four (2AZ-FE) and a 3.0-liter V6 (1MZ-FE). The four-cylinder provided efficient, everyday performance, while the V6 delivered stronger power and towing capability. Both engines were paired with a four-speed automatic transmission, with front-wheel drive standard and all-wheel drive available as an option. A hybrid version would come later, outside the 2003 model year.