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tony is right, as long as you keep running a vx (p07) with a one wire 02 you are always going to have the check engine light. it needs to be rewired with not just the 5 wire o2 sensor but all the vx specific items need to be wired in. i believe its 12 or 13 wires total. the o2 actually has 7 wires coming out of the ecu just for that, then you need egr valve and solenoid, and vtec etc.
further more making the dual stage work by adding the OBD2 jdm ecu is NOT going to be cut and dry. if it were that easy everyone would be doing it.
best thing to do would be find a tuning shop and buy an aftermarket ecu with nitrous capabilities (or i believe guys have done it with an automatic trans solenoid). guys use the regular vtec part to activate the lean burn part at the lower rpms. then they use the nitrous solenoid part to activate the performance vtec part. all the meanwhile the ecu will have to be tuned to get the economy and performance. $$
wiring it for the vx ecu then totally rewiring it to conform to the obd2 ecu would be crazy.
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Burn lean and prosper \\ //
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