The light itself doesn't tell you *what* the problem is. To find out, you need to:
* Read the Diagnostic Trouble Codes (DTCs): This is the most accurate way to identify the problem. You can do this in a few ways:
* OBD-II Scanner: Buy a relatively inexpensive OBD-II scanner (available at most auto parts stores). Plug it into the OBD-II port (usually under the dashboard) and it will read the codes. The codes will be numbers (like P0171, P0420, etc.), which you can then look up online to understand their meaning.
* Garage/Mechanic: Take your car to a mechanic or garage. They have professional diagnostic tools that can read the codes accurately and quickly. This is often the easiest and most reliable method.
Possible Causes (These are just examples, the actual cause depends on the DTCs):
* Oxygen sensor malfunction: A common cause of yellow engine lights.
* Mass airflow sensor (MAF) issue: This sensor measures the amount of air entering the engine. A faulty sensor can cause poor fuel mixture.
* Catalytic converter problem: A malfunctioning catalytic converter can trigger the light.
* Loose gas cap: While seemingly minor, a loose or damaged gas cap can cause an emissions leak, triggering the light. Check this first!
* Other sensor issues: Various other sensors (like crankshaft position sensor, camshaft position sensor, etc.) can cause the light to illuminate.
* Ignition system problems: Issues with spark plugs, ignition coils, etc., can also trigger the light.
Don't delay getting it checked. Driving with a yellow engine light on could damage your engine or affect performance and fuel economy. The sooner you get it diagnosed, the better.
