🚨 Diagnostic Profile
Vehicle Make: Acura
Technical Description: Cylinder 2 Misfire (P0302)
This code indicates that the Powertrain Control Module (PCM) has detected an incomplete or inconsistent combustion event specifically in the second cylinder. This is typically caused by a failure in the ignition delivery system, fuel delivery system, or a mechanical loss of compression within that specific cylinder.
🚨 Repair Difficulty Tier
Difficulty Rating: Intermediate
This repair requires the use of an OBD-II scanner capable of reading live sensor data (Freeze Frame) and a basic understanding of engine mechanical layouts to access the ignition coil pack. While replacing an ignition coil or spark plug is mechanically straightforward, accurately diagnosing whether the root cause is electrical (coil/wiring) versus mechanical (compression/valve) requires intermediate-level diagnostic tools such as a multimeter or compression tester.
🛠️ Resolution Steps
Step 1: Preliminary Inspection
Begin by visually inspecting the engine bay. Remove the engine cover to access the ignition coils. Check the wiring harness connector for Cylinder 2’s ignition coil for any signs of corrosion, melting, or loose pins. Inspect for oil intrusion into the spark plug tube, as oil contamination on the coil boot is a common cause of misfires in Acura V6 engines.
Step 2: Diagnostic Verification
Connect an OBD-II scanner and monitor live data while the engine idles. Perform a ‘Cylinder Contribution’ or ‘Balance Test’ if the scanner supports it to confirm Cylinder 2 is contributing less power than others. Swap the ignition coil from Cylinder 2 with a working cylinder (e.g., Cylinder 1). If the misfire code shifts to Cylinder 1, the coil is faulty. If the misfire remains on Cylinder 2, proceed to check the spark plug or perform a compression test to rule out mechanical valve/piston issues.
Step 3: Resolution & Reset Process
If the coil is confirmed faulty, replace the ignition coil and the spark plug for that cylinder (best practice suggests replacing all spark plugs simultaneously if mileage exceeds 60k miles). Once replaced, clear the Diagnostic Trouble Codes (DTCs) using the scan tool. Perform a test drive to allow the PCM’s adaptive fuel trims to relearn and confirm the Malfunction Indicator Lamp (MIL) does not return.
📦 Parts, Labor, and Budget Estimates
Required Components/Software: OEM Ignition Coil, NGK/Denso Iridium Spark Plug, Dielectric Grease, OBD-II Scan Tool (for reset).
Average Component Price: $45 – $120 (per coil), $10 – $20 (per spark plug).
Estimated Labor Hours: 0.5 – 1.5 hours (Diagnosis and single coil/plug replacement, depending on cylinder bank accessibility).