The 2018 Nissan Altima marks the final year V6 power was available, featuring the legendary 3.5L VQ35DE producing 270 horsepower. When P0306: Cylinder 6 Misfire Detected appears on V6-equipped models, your Altima has identified combustion problems specifically in cylinder 6.
Final Year of V6 Altima
The 2018 Altima represents the last opportunity to own a V6 Altima. The VQ35DE is a proven, reliable engine found in numerous Nissan and Infiniti vehicles. Cylinder 6 sits on one bank of this 60-degree V6, subject to standard wear patterns.
Common P0306 Causes on VQ35DE
Ignition coil degradation from heat cycling affects cylinder-specific spark delivery. Spark plugs approaching 100,000-mile intervals produce weak ignition. The plenum and intake manifold design can develop vacuum leaks. Fuel injector clogging or electrical issues disrupt atomization. Carbon buildup on intake valves affects airflow.
Diagnostic Approach
Confirm your 2018 Altima has the V6—base 4-cylinder models showing P0306 indicate anomalous codes. Scan for all diagnostic codes. Access cylinder 6 and inspect ignition components. Remove and evaluate spark plug condition against mileage. Test fuel injector operation. Perform compression testing to assess mechanical health.
Preserving V6 Altima
As the last V6 Altima, this generation is worth maintaining. Quality repairs ensure continued enjoyment of this sedan's spirited performance.