Help.. 1995 Pathfinder V6 3.0L engine with 82K miles. Recently, the check engine light came on and gas mileage went down to 10-12 MPG. FIrst thought is must be the O2 sensor. Today, installed a NTK (NGK) direct replacment plug oxygen sensor. So, try to clear all stored codes and turn the check engine ligt off, turn the ECU screw fully clockwise. Wait 5 seconds, then turn the screw fully counter clockwise. The check light stay off when in idle mode, however, every time I step on the gas pedal the check engine light goes on then turn off went release gas pedal. Anyone know what is happening with this? Do I need to drive the vehicle for a while so the engine management get use to the new O2 sensor? I have disconnected the battery so it will re-set the clear all error codes. Appreciate if you can chime in this matter.