Mil Eliminators and anti-foulers in combination are NOT needed.
There are 4 O2 sensors on this car.. two before the precat, and 2 after the cat.
the two before are referred to as "upstream" sensors and read the cars air/fuel ratio (lean or rich) they have nothing to do with catalyst efficiency.
the two after are the catalysts efficiency sensors, (downstream).
Effectively, you are ELIMINATING the downstream sensors from actually being used. there is no need to worry about "making your sensor last longer", etc, if you have mil eliminators. The eliminator circuit emulates a properly working o2 sensor, and tricks the car in to thinking that you have a properly working cat.
The way it works is this(very briefly)
the upstreams measure air:fuel ratios, the reading of which fluctuates very fast(many times a second). The readings are taken as a voltage depending on ohw rich you are, or how lean you are.
The sensors on the downstream side are after your cat (whose job is to burn up unused gas in the air coming from your engine) These sensors, because of the cat, fluctuate much slower. this is because the cat acted as a buffer.. mellowing out the changes from rich to lean. it is more stable, and averaged.
As long as your car looks at the differences between the upstream and the downstream and sees that the downstreams are trying to mimick the upstreams (only slower) then it assumes your cat is doing its job.
this is what MIL eliminators do.
the Mil eliminator is installed and "buffers" the voltage to look like it is a working downstream sensor (the car just looks for voltage, and it sees it.. so its good)
As for the CEL.. reseting it will take a full drive cycle (or two, in some cases) most likely all of a good 3 days of highway/streets/stop and go, etc. You will have to have two cold starts in there too, so just going to the store, using the highway, and going home using a street won't cut it. you need another cold start, too.
