Short answer: The Acura TSX used a K-series 2.4-liter engine in both generations—the 2004–2008 TSX with the K24A2 and the 2009–2014 TSX with the K24Z3 (i-VTEC). This article details which model years used which K24 variant and what that means for identification and maintenance.
The TSX, Acura’s compact sports sedan, was produced from 2004 to 2014 in the United States. Across both generations, Acura relied on the Honda K-series 2.4L family to power the cars, but the specific engine code and internals changed between generations. Understanding which K24 variant your TSX has matters for maintenance, parts compatibility, and potential swaps.
Below is a concise breakdown of which TSX years used the K24 engine.
- First-generation TSX (2004–2008) — K24A2 2.4L i-VTEC
- Second-generation TSX (2009–2014) — K24Z3 2.4L i-VTEC
These entries show the two K24 variants that equipped the TSX during its production run in the U.S. market.
The K24A2 and K24Z3 share core displacement and i-VTEC fundamentals but differ in calibration, internals, and emissions-era tweaks. When diagnosing or planning maintenance, confirm the exact engine code stamped on the block to ensure correct parts, torque specs, and service intervals.
Gen 1: 2004–2008 Acura TSX
Engine code K24A2
The 2004–2008 TSX used the K24A2 engine, a 2.4L i-VTEC powerplant. It delivered roughly 200 horsepower and around 160–164 lb-ft of torque, depending on the exact model year and transmission. This variant is widely associated with the early, sportier character of the TSX and shares many traits with other Honda K-series 2.4L engines of the era.
Maintenance notes: common considerations include timing chain wear, VVT actuator reliability, and typical wear on intake/exhaust components. Regular oil changes with the correct viscosity and timely VTEC system checks help sustain performance and reliability.
Gen 2: 2009–2014 Acura TSX
Engine code K24Z3
The 2009–2014 TSX switched to the K24Z3 variant, a 2.4L i-VTEC engine with refinements intended to improve emissions, smoothness, and high-RPM performance. It typically produced around 201 horsepower and a similar torque range to the earlier K24A2, with tweaks that affected response and overall drivability. This generation maintained the TSX’s balance of practicality and sportiness while aligning with newer regulatory standards.
Maintenance notes: the K24Z3 shares many service considerations with the A2 variant but can differ in calibration and certain components. As with the A2, routine oil services, proper VVT system diagnostics, and drivetrain inspections are key for longevity.
Summary
In short, every Acura TSX model year used a K-series 2.4L engine, with the K24A2 powering the 2004–2008 generation and the K24Z3 powering the 2009–2014 generation. If you’re identifying an engine for maintenance, parts, or a potential swap, verify the engine code on the engine block or valve cover to ensure compatibility and correct specifications.