Why does the engine yellow light come on after an oil change?
2 Answers
There are many reasons why the engine fault light may illuminate, such as a malfunctioning purge solenoid valve that controls fuel vapor emissions, a faulty air flow meter, ignition coil failure, thermostat malfunction, catalytic converter issues, oxygen sensor failure, excessive carbon buildup in the electronic throttle, etc. You can try resetting it to see if the engine yellow light remains on. Engine fault light indicators: Engine overheating, engine misfire, severe engine carbon buildup, poor fuel quality, sensor damage. Oil warning light indicators: Low engine oil level, excessive oil viscosity, blocked or improperly adjusted pressure relief valve, insufficient oil quantity. Tire pressure warning light indicators: Insufficient or excessive tire pressure, tire pressure light not being reset. Transmission fault light. Clogged transmission valve body, transmission sensor failure, transmission controller malfunction. Maintenance reminder light: Vehicle requires maintenance, insufficient oil pressure.
I just changed the engine oil last week, and then the yellow engine light came on, which made me really nervous. It's possible that a sensor was accidentally touched during the oil change, like the oil pressure sensor—those things are pretty sensitive, and even a slight disturbance can send false signals. Another possibility is that the new oil added might be the wrong type, and the car thinks the lubrication isn't normal, triggering the warning. A common reason could also be that the maintenance light wasn't reset, so the car still thinks it's time for service. I checked the oil level myself to make sure it was within the middle range on the dipstick and took a quick look for any signs of leaks. If the light is still on after these checks, don't risk driving long distances—head to a repair shop right away for a professional diagnosis to ensure safe driving.
