94 4.6 is ob2 is think (I'm like 99% sure of this). Either way, you have 2 o2 sensors in each pipe. One before the converter and one after the converter. They make a simulator, that is availible from summit racing that simulates the rear o2 sensor, as if the converters were present, or operating correctly in your case. Just plug them in and clear the code, which will be difficult to say the lease, you can try to disconnect the battery while the headlights are on, this may work, or drive the car for a while like a month or two. This will allow the car to go through 50 drive cycles and the code will clear it's self. Or take it somewhere and have them clear the code, wouldn't pay more than $20.00 bucks to have that done.
Good luck
Tim