This code indicates that the engine control module (ECM) has detected a misfire in cylinder 3. A misfire occurs when the spark plug does not fire properly, or when the fuel injector does not deliver enough fuel to the cylinder.
Possible causes:
* Spark plug wire is loose or damaged
* Spark plug is worn out or damaged
* Fuel injector is clogged or damaged
* Intake valve is stuck open
* Exhaust valve is stuck closed
* Piston ring is damaged
* Cylinder head gasket is leaking
How to fix it:
1. Check the spark plug wire. Make sure it is properly connected to the spark plug and that it is not damaged.
2. Replace the spark plug if it is worn out or damaged.
3. Check the fuel injector. Make sure it is not clogged or damaged.
4. Check the intake valve and exhaust valve. Make sure they are not stuck open or closed.
5. Check the piston ring. Make sure it is not damaged.
6. Check the cylinder head gasket. Make sure it is not leaking.
Note: If you are not comfortable performing these repairs yourself, you should take your vehicle to a qualified mechanic.
