07 grand cherokee 09430
I have a 2007 Grand Cherokee Limited with 135k miles. It went from running perfectly to not starting throwing a p0430 code. I had an O2 sensor replaced maybe 3 years ago but at that time only had a check engine light on. I'm going to go the new spark plug/O2 sensor route first. Any other ideas? I recently moved last year so I do not have a mechanic I know and trust. After sitting a day, the engine will turn over but it sounds very rough - so I won't let it run. Any suggestions so I won't have to listen to sales pitches to immediately replace my cat?