Cylinder 6 Misfire Detected
Cylinder 6 isn't firing properly, like a spark plug that keeps misfiring in one chamber of your engine. The engine computer detected the cylinder isn't contributing power on multiple combustion cycles.
The ECU monitors crankshaft speed variation using the crankshaft position sensor to detect misfires. When cylinder 6 fails to ignite properly, the crankshaft slows momentarily, triggering a misfire count. If misfire events exceed the threshold within a specific driving window, the fault code sets.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Crankshaft Acceleration Variance | Smooth, consistent tooth timing | Irregular deceleration on cylinder 6 combustion stroke |
| Misfire Count (per 1000 revolutions) | 0-2 misfires | 3+ misfires detected |
Code P0307 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P0307 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.