If your vehicle is showing check engine light is illuminated or flashing, here are the most likely causes and the parts you'll need to fix each one.
A loose, damaged, or missing gas cap allows fuel vapors to escape, triggering a minor EVAP system leak code. This is the most common and easiest to fix cause of a solid check engine light, often occurring right after refueling.
Worn spark plugs or failing ignition coils cause the engine to misfire. If the check engine light is actively flashing, this is almost always the cause and requires immediate attention to prevent severe catalytic converter damage.
Oxygen sensors measure the amount of unburned oxygen in the exhaust to adjust the fuel mixture. They naturally degrade over time, leading to decreased fuel economy and an illuminated check engine light.
The MAF sensor measures air entering the engine. It can fail from dirt buildup or be triggered if the sensor was accidentally left unplugged after checking or replacing the engine air filter.
These valves control the flow of fuel vapors from the gas tank into the engine to be burned. When they stick open or closed due to wear, they trigger an emissions code.
VVT solenoids adjust engine timing based on oil pressure. Low oil levels, dirty oil from missed oil changes, or a failed solenoid can trigger the light and cause sluggish performance.
The catalytic converter reduces exhaust emissions. If it fails, it is usually a secondary failure caused by ignoring other issues like engine misfires or burning oil for too long.