I changed the oil in my Toyota Corolla, but the oil warning light is still on. What could be the reason?

Hey folks, my emission warning light was on for a few days, then it went off. Anyone else had the same issue? What could be the reason?

What could be the reason for the Scirocco 2.0 engine warning light to turn off and then come back on again?

What could be the reason for the Haima S5's warning light being on or flashing, and the lack of acceleration?

Even after changing the middle exhaust pipe, the fault light is still on. What could be the reason?

What could be the reason for the headlights and brake lights turning on by themselves at night?

The 2008 Volkswagen Touran 1.8T shows a fuel consumption of 11 liters on the highway. After changing the fuel injectors and spark plugs, there's still no improvement. What could be the reason?

The dashboard reported low transmission performance, and then the car wouldn't accelerate. After restarting, the warning light went off and it drove normally. What could be the reason? (The onboard computer cleared the fault light, but it came back on before I got home.)

What could be the issue if the ABS warning light is on in a 2013 Santana 1.4 manual?

The engine warning light is on, indicating an oil leak. I changed the oil 4 days ago using 5-30w. What's going on? Does anyone know?

I have a Haima S5 with an automatic transmission, and occasionally the transmission warning light turns on. But when I press the brake, it goes off! When I try to read the error code, nothing shows up. What could be the reason?