Check engine light On and when was last tune-up??

Could be caused by one of the following below

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard it and keep testing.

Answered by rasmataz
68 questions asked

Add to the list:

Check the fresh air tube between the mass air flow sensor and throttle body for cracks or other air leaks.

Answered by caradiodoc (expert)
17,633 answers provided

I should add that on my grocery list instead of just the sensor-Thanks for the heads-up Have a nice one

Answered by rasmataz
68 questions asked