Check engine light code

[jmazz8]

Check engine light came on so i went to Auto zone .
They hooked me up to a code reader and we got one code
#P0442
Can anyone help me with this code, what does it meand and what can I do?
This is for a 1999 explorer sport

 

[aldive]

You will find the answer here:

http://www.obd-codes.com/p0442

 

[jremington59]

You didn't gas her up and leave it running did you?