Toyota: 99 corolla engine lights on, air filter, spark plugs

Question
I have a 99 corolla with 75000 miles, in have my engine lights come on. Do you know what this might be.

Thanks

Answer
Hello,

Try disconnect the battery for some minutes (this will reset the ECU), reconnect it and drive, accellerate the car full-throttle some times, and see if the engine light comes on again.
If it comes on again, it could be an injection problem, check the air filter, mafs (the sensor after the air filter), spark plugs, spark wires. Or it could be the catalysator which is gone. Bad fuel causes this problem, too.

Hope this helps!
Regards,
Jack