Hyundai Repair: Engine light on (additional info), senser, info thanks

Question
Hi..since I wrote you the other day, I wanted to give you additional information.  We replaced the air filter and the car is running better but the engine light is still on and it is hard to start..as tho the fuel is not getting thru.  Thought I'd add this info.
Thanks.

Answer
your going to have to change an replace the fuel filter an an run a fuel presure test to know if the pump is starting to fail an if the presure is low this is why you would be getting a ck eng light being there is not enough fuel to burn right the O senser will pick this up