Someone stole catalytic converter off my kids car. ( 04 element). Put new muffler system on. Apparently it burns out the computer. Car ran perfectly, but check engine light would not clear. ( could not get inspected) Was told buy a mechanic only dealer could fix. So I tried this plug and play unit. Was a bear to get computer out, But once in the check engine light went off immediately. Have not driven unit yet, but looks good so far. Glad I didn’t scrap car