OBD 2001 Pontiac Sunfire

my OBD Diagnostic Link Connector doesn't work on my 2001 Pontiac Sunfire any one know how I can get it to work again?
I took it to Auto Zone and they tried to get a code, But nothing come's on. My engine light is on and the car was acting funny. But since I put in some Tranny fluid it seems to be driving a lot better now. i don't have and hesitation from driving it. Which is a good thing But my engine light is still on. And the plug doesn't work so I can't get a reading to it. if any one can help that would be great. Thanks again!


Check the fuse for the cigarette lighter. The connector should be powered by the same circuit.