Ja, if your check engine light is on, you really should find the code and fix the problem before you just reset the check engine light... if you check under the passenger seat you should see a black box and on that black box is a read of of the codes your ECM spat out because there's something wrong with your truck. (all assuming it's a 95 or earlier) if there's number on the read out tell us what the numbers are and will help diag the problem.
If it's 96 or newer you'll not have a box black there, in which case you need to have your car hooked up to a ODBII reader.
To reset the the check engine light... follow the steps i've out lined but i can't stress, just resetting it will not fix the problem and the lights will prolly come back on... fix it then reset it.
sam
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