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Message: <blockquote data-quote="Brian95SVT" data-source="post: 327402" data-attributes="member: 8705">Ok, I have been getting this code and I'm not sure what else it could be. It's P0403 and it said something about catalysis below threshold. Now I have been searching online and all I can find are EGR related problems but I have already replaced my EGR Valve. I replaced all my o2 sensors. I've replaced all my spark plugs. I'm dumbfounded. When I'm driving my car and the check engine is ON it doesn't preform like it should, doesn't pull has hard as it should, etc. I went to the local Advanced Auto and deleted the code tonight then on the way home got on her and she pulled hard like it should. But I know this light will come back on tomorrow or within the next few days and I want to figure out what it is...... Any suggestions???!?!?!?Thanks, and sorry for all of you who know me and have been wondering where I've been... I will post another thread soon and explain.-Brian</blockquote>