A check engine light being on doesn’t have to be disastrous. However, it is best to be safe and get a diagnostics done. Doing this can prevent more expensive repairs being done in the future. Below are 7 reasons that a check engine light could be on.
1
Faulty Catalytic Converter
A catalytic converter turns carbon monoxide into a less polluting emission. Indications of problems are decreased acceleration and dark exhaust smoke.
2
Failing Oxygen Sensor
Oxygen sensors monitor the amount of unburned oxygen in the exhaust system. Drop in fuel mileage is an indication of a failing oxygen sensor leading to catalytic converter trouble.
3
Bad Mass Air Flow Sensor
Mass air flow sensors monitor the amount of incoming air and determine how much fuel to inject with it. Your engine stalling after you start it is one indication of mass air flow sensor trouble.
4
Failing Ignition Coil
For your vehicle to start up a spark needs to be generated. The ignition coil plays a central role in generating this spark. Misfiring and power loss are some indications of a failing engine coil.
5
Loose/Missing Fuel Cap
Your check engine light could be on because of a loose or missing fuel cap. It can also cause fuel to evaporate before you use it.
6
Failing Spark Plugs
Spark plug failure can cause a decrease in performance fuel efficiency. Generally older vehicle spark plugs should be replaced after 48000km and vehicles manufactured after 2000 should be replaced after 160 000km.
7
Bad Battery/Charging System
A failing battery can cause low voltage at the computer, which can consequently cause the check engine light to turn on.