The 2024 Lexus NX continues with turbocharged 4-cylinder and hybrid powertrains, including the 2.4-liter turbo (NX 350), hybrid (NX 350h), and plug-in hybrid (NX 450h+) variants. All versions use 4-cylinder engines. A P0305 diagnostic trouble code indicating cylinder 5 misfire presents a diagnostic puzzle.
The P0305 Code Contradiction
Standard OBD-II code P0305 indicates "Cylinder 5 Misfire Detected," but the NX's engine configurations have cylinders numbered only 1 through 4. This code appearing suggests a diagnostic system anomaly requiring investigation.
2024 NX Powertrain Options
All 2024 NX variants use 4-cylinder-based powertrains. The NX 350's turbo-4 produces 275 horsepower. The NX 350h combines a 4-cylinder with electric motors. None include a fifth cylinder, making P0305 anomalous across all variants.
Investigating the Anomalous Code
Proper diagnosis requires Lexus Techstream diagnostics to analyze actual misfire counter data for each of the four physical cylinders. The technician should determine whether real misfires are occurring while being reported incorrectly, or if this is purely a software error.
Warranty Considerations
As a current-year model, your 2024 NX should be under warranty. Software-related diagnostic issues should be addressed by Lexus dealers at no cost.