In brief, the Scion xB came with two engine options across its production life: a 1.5-liter four-cylinder in the original model and a 2.4-liter four-cylinder in the redesigned second generation.
Engine options by generation
The following summaries describe the two powertrains that powered the Scion xB, reflecting the model’s split between generations.
First generation (2004–2006)
Engine details for the initial xB include:
- Displacement and configuration: 1.5-liter inline-four (four-cylinder)
- Engine code: 1NZ-FE
- Power output: about 108 horsepower
- Drivetrain: front-wheel drive
In summary, the original Scion xB used a compact 1.5L four-cylinder with around 108 hp, designed for urban practicality rather than high performance.
Second generation (2007–2015)
Engine details for the redesigned xB include:
- Displacement and configuration: 2.4-liter inline-four (four-cylinder)
- Engine code: 2AZ-FE
- Power output: about 158 horsepower
- Drivetrain: front-wheel drive; transmission options included a 5-speed manual or a 4-speed automatic
In summary, the second-generation xB moved to a larger 2.4L engine to boost performance while maintaining the practical, boxy design that defined the model.
Summary
Across its production life, the Scion xB offered two distinct four-cylinder engines: a 1.5L 1NZ-FE in the first generation and a 2.4L 2AZ-FE in the second generation. This shift marked a move from a compact city-focused powertrain to a more capable, highway-friendly engine while preserving the xB’s distinctive practicality and style.