The refreshed 2022 Lexus IS delivers sport sedan dynamics with proven powertrain options. When your IS displays P0304 indicating a cylinder 4 misfire, understanding your engine configuration ensures accurate diagnosis.
Understanding P0304 in Your IS
The 2022 IS offers the 2.0L turbocharged four-cylinder or 3.5L V6 depending on configuration. For the turbo model, cylinder 4 is at the rear of the inline-4. For the V6, cylinder 4 is on the rear left bank. Both engines use individual coil-on-plug ignition.
Engine-Specific Factors
The 2.0L turbo operates under higher combustion pressures, stressing ignition components and potentially contributing to carbon buildup on intake valves over time. The 3.5L V6 has proven reliability with more conventional maintenance requirements.
Diagnostic Steps
Identify your engine and locate cylinder 4. Access the ignition coil and inspect condition. Remove the spark plug and check electrode wear. On turbo models, verify boost system integrity.
Resolution Approach
Replace spark plugs with Lexus specifications. Test ignition coil output. If within warranty, dealer diagnosis ensures proper repair. Address any boost or carbon issues on turbo models.