The 2018 Acura TLX's check engine light accompanied by vibration and P0302 indicates a cylinder 2 misfire requiring attention. Whether your TLX has the 2.4L four-cylinder or 3.5L V6, cylinder-specific misfires demand systematic diagnosis to identify the root cause.
Understanding P0302 in TLX Engines
P0302 indicates the ECU has detected combustion failures specifically in cylinder 2. The vibration you feel occurs because the engine's balance is disrupted when one cylinder fails to contribute its power stroke. The four-cylinder is more sensitive to single-cylinder misfires than the V6 due to fewer cylinders absorbing the imbalance.
Common Misfire Causes
Ignition coil failure is common as coils age. Spark plug wear creates inconsistent ignition. Fuel injector deposits affect spray patterns. On the V6 with VCM, cylinder deactivation-related wear may contribute. Vacuum leaks can affect specific cylinders. Low compression from valve or ring issues causes mechanical misfires.
Diagnostic Process
Swap the cylinder 2 ignition coil with another cylinder to determine if the misfire follows. Inspect spark plug condition comparing to other cylinders. Test fuel injector operation through balance testing. Check for vacuum leaks near the affected cylinder. Perform compression test if ignition and fuel systems test good.
Repair Recommendations
Replace all ignition coils or spark plugs together rather than just one—they've all experienced similar operating hours. Use OEM or OEM-equivalent parts. Address any vacuum leaks found. Clear codes and monitor for recurrence after repair.