The 2024 Acura Integra continues with the 1.5-liter turbocharged 4-cylinder engine, producing 200 horsepower in standard form and 320 horsepower in the Type S variant (still using 4 cylinders, just the K20C1). A P0305 diagnostic trouble code indicating cylinder 5 misfire presents a diagnostic puzzle since all Integra variants use four-cylinder engines.
The P0305 Code Contradiction
Standard OBD-II code P0305 indicates "Cylinder 5 Misfire Detected," but the Integra's engine configurations have cylinders numbered only 1 through 4. This applies to both the standard 1.5T and the Type S 2.0T—neither has a cylinder 5.
Type S Clarification
Even the high-performance Integra Type S with its 2.0-liter turbocharged engine uses an inline-4 configuration. Despite more cylinders being common in performance variants of other vehicles, the Integra Type S maintains the 4-cylinder heritage.
Investigating the Anomalous Code
Proper diagnosis requires Honda/Acura HDS 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.
Warranty Coverage
As a current model, software-related diagnostic issues should be addressed under Acura warranty.