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Message: <blockquote data-quote="BWB95GT" data-source="post: 871009" data-attributes="member: 15327">I have been having idle issues and just generally running rough with a car I just bought. The previous owner told me that the MAF sensor was bad, so I replaced that immediately and no change. So I cleaned the IAC, and still no changes. I checked for vacuum leaks and didn't find any (though it was the first time I had ever checked, so there's a chance I missed one, but I don't think I did)So I checked the CEL codes and I ended up with 172 & 176 right and left heated o2 sensors reading lean. My question is, should I just replace the o2 sensors? Or do I need to figure out why my car is running lean? I really don't want to blow any more money on something that wont fix my problem. Any help would be greatly appreciated.</blockquote>