To find out why the light is on, you need to:
* Get the diagnostic trouble codes (DTCs) read: This can be done at a local auto parts store (like AutoZone, Advance Auto Parts, etc.) for free, or by a mechanic. The codes are numbers that correspond to specific problems.
* Inspect the car: Once you have the codes, you (or a mechanic) can look for visual clues related to the problem indicated by the codes. This could involve checking fluids, looking for leaks, inspecting components, etc.
Common reasons for a check engine light in a 2006 Chevrolet Cobalt LS include (but are not limited to):
* Oxygen sensor issues: These sensors monitor the exhaust and can fail, leading to poor fuel economy and emissions.
* Mass airflow sensor (MAF) problems: This sensor measures the amount of air entering the engine and a malfunction can cause poor performance and the check engine light.
* Spark plug or ignition coil issues: Faulty spark plugs or ignition coils can cause misfires, leading to the light coming on.
* Catalytic converter problems: A failing catalytic converter can trigger the check engine light.
* Loose or damaged gas cap: Believe it or not, a loose or faulty gas cap can trigger the light.
* PCV valve issues: A problematic positive crankcase ventilation valve can cause various engine problems.
Without knowing the DTCs, any attempt to diagnose the problem is pure speculation. Get the codes read – that's the first and most crucial step.
