Technical Stft and Ltft readings make no sense.

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Technical Stft and Ltft readings make no sense.

Ganjys

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Hello, two weeks ago my check engine light came on, it turned out it was catalyst efficiency error. After investigation it turned out the pre catalyst o2 sensor had gone bad. It took two weeks to get the replacement during which I had no choice to keep driving with a bad sensor.

Now it is replaced, I cleared the codes. the fuel consumption became better and the exhaust doesn't smell anymore. But the problem is that the fuel consumption is still higher then it was before the fault. All the i/m readiness tests have been run, since the dtc clear and the check engine light hasn't come on yet.
I used my scanner for the live data, but the Ltft readings is all over the place, fluctuating way too much. Any ideas what could be wrong? And could it be because I haven't properly resetted the ecu?
 

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I'm not sure if charts are bad. I saw something similar on mine through MES charts, and fluctuating from almost 0 to almost 1 is OK. I didn't studied these things but I remember from one YouTube video (EricTheCarGuy ?) that he measured lambdas and explained that this fluctuation is OK

But definately wait for other guy's replies...Here are skilled people so maybe they explain it in more detail
 
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