heres the deal, the front O2 monitors air fuels and sends voltage adjustments the DME, rear O2's ensures the cats are doing its job off of what the front 02's are telling the DME. You can use sparkplug foulers but most willl need to be modified to work with your 02. The main purpose it to move the o2 sensor out of the the air stream so it will not see better flow and throw a code. you can also use a simulator which should be easily replicated with a diode. you need to find out what the voltage is on the rear 02 sensor and just clamp the wire that goes to the dme by adding the diode to the wire. this will only allow the 02 to see the proper voltage and no more
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