2007 saturn ion, fault code P0121

What is your question?

Ok, this code showed up and I replaced the stupid electro peddal. ther fault is still there. I have read other posts saying the cause maybe the throttle body sensor being dirty. Also something about floor mats being damaged or torn can have someething to do with the fault... what kinda of car is this?? This is my daughters car but the first chance I get I'm dumping this turd. Any help would be great. Thanks. ramblnman64