I recently swaped a b16a3 into a 97 ek, ive been running a JDM P2T OBDIIa ecu. Im missing the evap purge valve, vtect pressure switch (had to wire it manually and it work), oil crank position sensor (did crank bypass trick) engine run flawless no problem. Im getting ready for emmisions and i was wondering if i need a second o2 sensor for this motor/ecu because i have no check engine light. i had to extend my first o2 sensor wires from the exhaust manifold to the back to the downpipe. and where would this second o2 sensor go? or could i splice the wirefrom the bottom of my car to the sensor thats in the bung now?