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Check engine light indicates anything from a failed sensor to serious engine malfunction!

Common problems:

Mass Air Flow Sensor
Function:     Monitors the mass of air entering engine to balance the amount of fuel needed for engine demand.
Symptoms of failure include:
-Poor fuel mileage (as vehicle does not mix the air and fuel properly when the MAF is malfunctioning)
-Poor performance due to weak acceleration, stalling & rough idle
-Vehicle may not start

Coil On Plug
Function:     Provides the electrical current for the plug to spark, which ignites fuel.
Symptoms of failure include:
-No-start, hard start, long crank time
-Misfire, lack of power
-Poor fuel economy

Exhaust Gas Recirculation (EGR)
Function:     "Gate" that allows exhaust gas back into engine resulting in a cooler, more complete burn of the fuel
Symptoms of failure include:
-Poor engine performance
-Failed emissions test
-Engine surging

Crankshaft/Camshaft Position Sensor
Function:     Informs coil when to send spark to fire engine
Symptoms of failure include:
-No-start, hard start
-Long crank time, misfire
-Premature engine bearing wear

Oxygen Sensor
Function:     Measures oxygen to notify computer to increase or reduce fuel supplied to engine
Symptoms of failure include:
-Reduced gas mileage and engine performance, can cause damage to the catalytic converter
-Failed emissions test

*Components may vary depending on vehicle*

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