I had to disconnect this hose and another to get a new brake line in. Apparently I didn't put it back on snugly enough because when I left from work today I found the check engine light was on. I noticed this hose was disconnected when I looked under the hood, so I put it back on thinking I'd solved the issue. The light is still on. I've had no issues with the engine thus far, no overheating, oil is fine. I dunno what to do from here besides rolling it into a shop, but I've never had to repair the TJ at an auto shop and I'd prefer to solve this myself, especially since it seems I know exactly what caused it. Advice?