How many spark plugs does a Lexus IS250 have?
The Lexus IS250 has six spark plugs—one for each of its six cylinders.
The IS250 is powered by a 2.5-liter V6 engine, and like most six-cylinder engines, it uses a one-spark-plug-per-cylinder arrangement. This article explains the plug count, the engine layout, and what owners can expect when servicing the ignition system.
Engine configuration
The IS250’s powerplant is a compact V6 designed to balance performance with efficiency. With six cylinders arranged in a V configuration, the engine requires six ignition sources—one per cylinder—to ensure reliable combustion and smooth power delivery.
- Engine: 2.5-liter V6
- Cylinders: 6
- Spark plugs: 6 total, one per cylinder
- Ignition: typically coil-on-plug per cylinder
One spark plug for each cylinder means the ignition system is physically distributed across the engine, helping with timing and coil reliability. In servicing the car, technicians typically remove the intake plenum to access the plug locations.
Maintenance implications
Replacement intervals and spark plug type vary by model year and market. Many IS250s use iridium or platinum-tipped plugs with longer service lives, but some older or regional variants may use copper-core plugs with shorter intervals. Always refer to the owner’s manual or a Lexus service advisor for the exact specification and recommended replacement interval for your vehicle.
- Typical replacement intervals: commonly around 60,000 to 120,000 miles depending on plug type
- Access considerations: plugs are threaded into the cylinder head; some models require removal of ancillary parts to reach them
- Common symptoms of worn plugs: rough idle, misfires, reduced fuel economy, or degraded acceleration
Pro tip: if you’re experiencing ignition-related symptoms, a professional inspection can verify whether all six plugs—and their corresponding ignition coils—are functioning correctly.
Summary
The Lexus IS250 design uses six spark plugs—one for each of its six cylinders. This straightforward count aligns with its six-cylinder V6 layout, and maintenance practices revolve around the six individual plugs with care given to the engine’s ignition system as a whole.
