if your check engine light is on there should be a code.. the tod light you have to check with an isuzu dealership tool or by "hotwiring" your data port under the dash.. i forget which pins you are supposed to connect but do a search for "abs code" and im sure you will find the instructions


if they cant get a "P" code for the check engine light (or turn it off, even momentarily) check the fuse for your horn under the hood, if that blows, the data port under the dash stops working