1. Faulty Oxygen Sensor: Monitors the amount of oxygen in the exhaust gas. If it malfunction, the engine check light may illuminate.
2. Spark Plug Issues: Worn or damaged spark plugs can cause misfires and trigger the engine check light.
3. Faulty Ignition Coil: If the ignition coil fails to provide sufficient voltage, misfires can occur, leading to an illuminated engine check light.
4. Fuel Injector Problems: If fuel injectors become clogged or damaged, proper fuel delivery is compromised, causing engine misfires and the check engine light to activate.
5. Catalytic Converter Issues: A malfunctioning catalytic converter can affect engine performance and potentially cause the check engine light to come on.
Misfire Causes:
1. Engine Vacuum Leak: If there's a leak in the vacuum hoses or gaskets, it can lead to a lean air-fuel mixture, resulting in engine misfires.
2. Fouled Spark Plugs: Spark plugs that are worn or fouled with deposits can cause intermittent sparks or complete failure to ignite the air-fuel mixture, resulting in misfires.
3. Ignition System Problems: Faulty ignition coils, distributor caps, or rotors can disrupt proper spark delivery to the cylinders, leading to misfires.
4. Fuel System Issues: Low fuel pressure or faulty injectors can cause insufficient fuel delivery, resulting in lean conditions and potential misfires.
5. Mechanical Problems: Engine components such as worn piston rings, faulty valves, or a stretched timing chain can cause engine misfires.
It's recommended to have your Holden Barina diagnosed by a qualified mechanic to identify the specific cause of the engine check light and misfire issue and address it appropriately.
