The 2022 Infiniti QX60 represents a complete redesign of Infiniti's popular three-row crossover, featuring a new 3.5L V6 engine. When this refined powerplant develops a rough idle accompanied by check engine light and P0300 code, the luxury experience is compromised. Understanding the diagnostic approach for this new platform helps resolve the issue efficiently.
Understanding P0300 in the New QX60
Code P0300 indicates random or multiple cylinder misfires—the engine computer detects combustion failures but can't attribute them to a single cylinder. In the QX60's 3.5L VQ-series V6, this typically points toward systemic issues rather than single-component failures.
Symptoms Beyond the Light
- Rough, uneven idle most noticeable in Park
- Vibration through steering wheel and seats at stops
- Possible fluctuating RPM at idle
- Reduced fuel economy
- Hesitation during light acceleration
- Possible stalling in severe cases
Common Causes
Spark Plug Wear
Even with the 2022's relatively low mileage potential, spark plugs can fail prematurely or have manufacturing defects. The V6 configuration's six plugs mean multiple opportunities for issues.
Ignition Coil Problems
Individual coil packs can fail, and if multiple are marginal, random misfires result rather than cylinder-specific codes.
Fuel System Issues
Fuel quality problems, injector issues, or fuel pressure irregularities affect all cylinders, creating the random pattern P0300 describes.
Vacuum Leaks
Leaks in the intake manifold, vacuum hoses, or related components introduce unmetered air that affects the entire engine's air-fuel mixture.
MAF Sensor Contamination
A dirty or failing mass airflow sensor causes incorrect fuel calculations across all cylinders.
Repair Costs
| Repair | Parts | Labor | Total |
|---|---|---|---|
| Spark plug replacement (6) | $80-$150 | $150-$250 | $230-$400 |
| Ignition coil replacement (6) | $250-$400 | $200-$300 | $450-$700 |
| MAF sensor cleaning | $15 | $50-$100 | $65-$115 |
| Vacuum leak repair | $25-$100 | $100-$200 | $125-$300 |
Warranty Consideration
As a 2022 model, your QX60 is covered by Infiniti's 4-year/60,000-mile basic warranty and 6-year/70,000-mile powertrain warranty. Misfire diagnosis and repair should be performed under warranty.