Four spark plugs in total—one for each cylinder.
In the 2019 Civic, the engine options included a 2.0-liter naturally aspirated four-cylinder and a 1.5-liter turbocharged four-cylinder. Both configurations use four spark plugs, regardless of trim, including the Civic Si which uses the same 1.5L turbo family.
Engine options and spark plug count
The following two engine configurations were used in the 2019 Civic variants; the spark plug count remains the same for both.
- 2.0 L naturally aspirated four-cylinder engine
- 1.5 L turbocharged four-cylinder engine
Conclusion: Both engines have four spark plugs in total (one per cylinder). This applies across common trims such as LX, EX, EX-L, Touring, and the Si variant, although the Si uses a high-performance version of the 1.5L turbo.
Maintenance considerations
For maintenance, follow the owner's manual guidance. 2019 Civics typically use iridium or platinum plugs with a replacement interval around 100,000 miles, but intervals can vary by engine type, driving conditions, and service history. If you notice misfires or rough running, have the ignition system checked by a professional.
Summary
In short, a 2019 Honda Civic uses four spark plugs, one for each of its four cylinders, regardless of whether you have the 2.0L or 1.5L engine.