Question regarding 2003 dodge ram van 1500?

my dads van got the check engine light poped up yesterday, i believe its something to do with sensors etc. but i am not sure untill i pull out the code with OBD reader. ok now the question is...where should i look for the spot where the OBD reader hooks up so i can pull out the code. his van is diffrent than my... show more my dads van got the check engine light poped up yesterday, i believe its something to do with sensors etc. but i am not sure untill i pull out the code with OBD reader. ok now the question is...where should i look for the spot where the OBD reader hooks up so i can pull out the code. his van is diffrent than my maxima so i have no idea if there is an option to hook the OBD reader any where on the van. any advice? thanks in advance..
Update: and what could cause the CEL to become active???
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