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Ok i see you replaced your cats Now the question is did you use oem parts ?? Cause that can make all the difference! And do you have dual cats if so did you replace the one twice or both ?? Also check your ground wire for corrosion or a loose connection this ground can be found either on the right front of the engine or the rear of the engine. one more thing just make sure there are no leaks before the converters. Good luck
the code you speak of relates strictly to the catalytic converter. it is possible there is a faulty sensor, however that choice is highly unlikely. Catalytic converters carry a 5/50 7/70 and 8/80 warranty depending upoin the state you live in...this may be a repair covered under manufacturers warranty. this code is becoming very prevelant in many auto lines as a result of the insurgence of ethanol dilution of our fuels. the "10%" ethanol sticker is located on most pumps. Most vehicles on the road today are not flex fuel capable and this ethanol is wreaking havoc on our fuel and emission systems, especially the catalytic converters. the converters are caked with deposits from the ethanol, reducing its effeciency. if your have access to well worth branded products (not available in ANY parts store, typicaly dealers and repair shops only) try adding on succesive tank loads of fuel their product called Octi-Plus. this products helps remove ethanol products, and very well may save yoiu big $$$ for that converter repair bill...i hope this helps..check out this link....
I think you might need to ask someone to throttle up the car and you look underneath to try locating the rattling noise. Don't forget that this model runs the exaust pipe in front of the motor so it might be an exaust rattle as well??