i'd change out the O2 sensor. good chance you shattered the element.

you need a paper clip and find the diagnostic port. short the port and the codes will flash on the dash thru the CEL. if you dont know where the port is, get a manual... cuz you'll need it to decipher the code anyways.

www.oxygensensors.com has oem and universal O2 sensors for 1/3 the price of the dealership.