my service engine light came on,again. but when i ran the codes it came up as e046. in the codes there is no e046...any clue??

I believe it's: "Right to Left Bank Fueling Difference".

my service engine light came on,again. but when i ran the codes it came up as e046. in the codes there is no e046...any clue??
what does that mean...and what do i need to do..do you know how to clear trouble codes.

See this Thread (http://server.madisonross.com/~cadillac/forums/showthread.php?t=2576&highlight=trouble+code%2A) for more information on trouble codes.

What car do you have? What problems has it been experiencing?

The problem is most likely a clogged or faulty injector or injectors although it could be anything in the fuel system - fuel lines, pump, filter, rails, pressure regulator, etc.. Could also be the PCM or sensors.