The engine in a 2004 Honda Civic depends on the trim: most models use a 1.7-liter four-cylinder, while the performance-focused Civic Si uses a 2.0-liter engine.
The 2004 Civic belongs to Honda’s seventh generation (2001–2005) and was offered with two main engine families. The base DX and LX models used a 1.7-liter four-cylinder from Honda’s D-series, delivering about 115 horsepower, with EX trims nudging output to roughly 127 horsepower. The high-performance Civic Si was equipped with a 2.0-liter inline-four from Honda’s K-series, the K20A3, producing around 160 horsepower. Transmission options varied by trim, with manual gearboxes common on the Si and some EX configurations and automatics available on the base trims.
Engine options by trim
The following breakdown shows the primary engines used in the U.S.-market 2004 Civic, by trim level.
- DX and LX: 1.7-liter inline-4 from the D-series family, roughly 115 horsepower. Transmission options included manual and automatic configurations depending on the model and package.
- EX: 1.7-liter inline-4 (D-series with refinements), delivering about 127 horsepower, with transmission choices similar to the DX/LX depending on the build.
- Si: 2.0-liter inline-4 DOHC i-VTEC (K-series), the K20A3 engine, producing around 160 horsepower and typically paired with a 6-speed manual transmission.
In summary, the engine lineup for the 2004 Civic centers on a 1.7-liter D-series for everyday models, with the Si standing out for its 2.0-liter K-series powerplant.
Summary
The 2004 Honda Civic offered two primary powertrains: the 1.7-liter D-series engine for most trims and the 2.0-liter K-series engine for the Civic Si. This produced a range from about 115–127 horsepower in the non-Si models to about 160 horsepower in the Si, with corresponding differences in transmissions and driving dynamics. When evaluating a used 2004 Civic, check the engine code or service documentation to confirm the exact powertrain for that vehicle.