A P0303 code on your 2023 Toyota Highlander indicates that the engine control module has detected cylinder 3 misfires beyond acceptable parameters. The updated Highlander features revised powertrains.
2023 Highlander Powertrain Changes
The 2023 Toyota Highlander introduced a new 2.4L turbocharged four-cylinder replacing the previous V6, plus continued hybrid offerings with the 2.5L engine and electric motors.
2.4L Turbo Four-Cylinder
The new turbo four-cylinder produces 265 horsepower with strong torque. With only four cylinders, each contributes 25% of power. The turbocharger adds diagnostic considerations.
Turbo System Considerations
The 2.4L turbo operates under boost pressure, increasing demands on ignition components. Boost system integrity affects combustion quality across all cylinders.
Hybrid Option
The Highlander Hybrid continues with the 2.5L four-cylinder and electric motors. This proven system has excellent reliability.
Warranty Coverage
Your 2023 Highlander is protected by Toyota's warranty. Misfire repairs should be covered. Contact your dealer.