The Acura TSX uses a 2.4-liter K-series four-cylinder engine across its two generations. In North American markets, the first-generation TSX (2004–2008) used the K24A2, while the second-generation TSX (2009–2014) shifted to the K24Z3 variant.
The following overview breaks down which TSX models employed the K24 family and what that meant for power, responsiveness, and maintenance. The TSX was designed as a refinement-focused sedan built on Honda’s Accord platform, and the K-series engines underpinning it were chosen to balance rev-happy performance with everyday reliability.
First-generation TSX (2004–2008)
The first-generation TSX relied on a single, high-revving 2.4-liter K-series engine tuned for sport-sedan performance. The list below captures the key details most owners encounter.
- Engine code: K24A2
- Displacement: 2.4 liters
- Power output: about 200 horsepower
- Torque: around 160–164 lb-ft
- Valve technology: i-VTEC
- Year range in North America: 2004–2008
In sum, the first-generation TSX offered a straightforward, well-regarded 2.4L K-series powerplant that balanced smoothness with a willingness to stay high in the RPM range, fitting the TSX’s emphasis on refined performance.
Second-generation TSX (2009–2014)
With the redesign came an updated K-series variant that continued the TSX’s athletic persona while offering refinements in efficiency and emissions. The following details cover the commonly used configuration for this generation.
- Engine code: K24Z3 (North American market)
- Displacement: 2.4 liters
- Power output: about 201 horsepower
- Torque: around 172 lb-ft
- Valve technology: i-VTEC
- Year range in North America: 2009–2014 (released as a refreshed model in 2010)
Overall, the second-generation TSX maintained the 2.4L family but with updated tuning, yielding a touch more horsepower and improved driveability, while preserving the engine’s reputation for reliability and rev-happy responsiveness.
Summary
Across its two generations, the Acura TSX used two K-series 2.4-liter engines: the K24A2 in 2004–2008 models and the K24Z3 in 2009–2014 models. Both engines delivered a blend of sporty performance and everyday practicality that defined the TSX’s niche in the early 2000s to mid-2010s market.