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Message: <blockquote data-quote="Darkside" data-source="post: 485770" data-attributes="member: 10887">The car had a Vacuum leak before, and my mechanic replaced all the vacuum hoses-lines, etc. so i dunno.. A guy off another forum said this " the o2s being old or dirty from your head gasket blowing would cause all of that. cause when the ecm throws a code it goes into dummy mode it automatically runs rich as crap. just clean your o2s or put new ones in and clear the codes and you will be fine. the glycol in the antifreeze will blow strait through the cats and collect in and on the o2 surface and cause it not to read at all"</blockquote>