my mp3 is throwing P0660!! what should i do?

[96superneon]

Hey i went into autozone to clear my codes cuz i thought i only had the P0421 which im gonna fix in the morning with the cel eliminator but i was surprised to see it throwing a second code....P0660. how can i fix this...what could it be? any help would be great! thanks

 

[96superneon]

well after 130 miles with the cel eliminator on no light! so i guess the second code (P0660) was caused by the first code (P0421).