Hello, I have a question about the waveform of the downstream sensor on a nissan sentra 2L. I am viewing the signal on Torque Pro app and my upstream is around 450mV until idle and my downstream get oscillating (min. 100mv, max 900 mv) when warmup and rpms are over 3000, thats ok. But the frequency of the oscillation of the downstream sensor is very slow (one cycle in 5 seconds), its means that i have to change the sensor? or i have another problem?, I don,t have MIL light on, but my mileage is bad on the city and good on highway. Thanks for your support.
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