Again - we need good reference data. If the O2 voltage is swinging normally and as expected, there is no way the STFT can be static as you report - it will always follow the O2 - that is the way the closed loop system is designed to operate.Im unable to record, so as it stands, Ltft is -5% and stft is -12% at idle and at 1500 rpm’s ltft is 0 and stft is -18%. Upstream 02 sensor is oscillating normally from .03 volts to .88 I put a new one in, and down stream 02sensor is at 0.16volts constant.