sometimes under the dash where the diagnostic connector is, theres a "diagnostic button"..
turn on the key but without the engine running, and press that button.. the check engine light will flash out sequences which are the error codes.. might be able to match the codes up to a sensor..
my guess is likely just a wire or something didnt get plugged back in tight.. make sure the engine ground is good.. should be a large strap screwed into the block and maybe the head, which goes to the frame.. if that isnt making good contact, sensors can wig out..
-Christopher
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