The 2022 Lexus NX second generation is powered by turbocharged 4-cylinder engines, offering either the 2.4-liter turbo in NX 350 or hybrid variants with 4-cylinder powertrains. When a P0305 diagnostic trouble code appears indicating a cylinder 5 misfire, this represents an anomalous diagnostic situation requiring specialized investigation.
Understanding the P0305 Anomaly
The P0305 code translates to "Cylinder 5 Misfire Detected" in standard OBD-II terminology. However, the NX's turbocharged 4-cylinder engine contains only cylinders numbered 1 through 4. The appearance of this code indicates a diagnostic system irregularity.
2022 NX Engine Configuration
The redesigned 2022 NX uses the new 2.4-liter turbocharged 4-cylinder (T24A-FTS) producing 275 horsepower. This represents a departure from the previous generation's naturally aspirated 4-cylinder. The inline-4 uses a 1-3-4-2 firing order calibrated for four cylinders only.
Diagnostic Protocol
When encountering P0305 on your 4-cylinder NX, a qualified technician should use Lexus Techstream diagnostics to verify actual misfire counter data for cylinders 1-4. Software updates and communication errors should be investigated.
Possible Causes for Erroneous Code
This anomalous code may result from ECM software requiring updates (common on new-generation vehicles), control module communication errors, or aftermarket device interference.