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You can get o2 emmulators on ebay. They are mainly for replacing rear o2 sensors on obd2 systems.
In your case, this won't be needed.
1. All an o2 emmulator will do is send the ecu incorrect fuel mixture signals.
2. A front o2 will read properly without a cat.
3. Even if you disconnected the o2, it won't cause the CEL to come on. It would just hurt your fuel economy and give a stored code 21.
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