Ask for and share advice on using the PicoScope kit to fix vehicles here.
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ta very much peugeot 206 1.4 lambda back probed at connector and earthed at the battery but the amount of noise is ridiculous tried a couple of different earths and different croc clips??
Use a filter to get a cleaner signal. Lambda signals can be very noisy.
how do i do that?
Click on the channel number above the waveform. There you can activate the filter.
If all you're scoping is the O2 sensor then you can use it's own ground for a cleaner signal, I don't worry about much noise on an O2 & just add a filter.