Cylinder 3 misfire detected
Where to start
Misfire in cylinder 3. Checked the same way: by swapping the plug and the coil.
What the cylinder number gives you
The last digit names the cylinder: 3. That is the most useful thing in this code — it turns a search across the whole engine into a check of one cylinder.
Swap and watch. Move the plug and the coil between cylinder 3 and a neighbour, clear the code and drive. If the fault follows the part, the part is to blame. If it stays on cylinder 3, the cylinder is: the injector, compression, a valve. This is the only way to tell one from the other without taking anything apart.
⚠️ Misfire is not only ignition. Check fuel trims: a large plus on one bank points to air, not to the plug. And do not clear the code before the swap — you lose the evidence.
How to put together a report a mechanic will actually read
How the code is built
All codes in «Ignition system and misfires»
How it feels behind the wheel
The same fault shows itself in different ways. Each sign below says what to look at in the live data.
How the app helps
CarScan reads this code from your car through an OBD-II adapter, shows whether it is active now or only stored, names the module that reported it, and puts it into a plain-text report for your mechanic.