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Hi most diagnostic machines will do a lambda check for you /mine does but it did cost over a grand .most of the cheap ebay ones will only read faults so might be worth paying to plug it in .
I recommend you to check this by someone who knows this stuff because you don't seem to understand much, no offence!
They are 4 wire zirconium dioxide narrow band sensors. They usually have two black, a white and a grey wire. Black is the heater circuit, static measure should be a few ohms, dynamic measure a corresponding switched current. The other two are sensor signal and ground. I don't know which is which but shouldn't be hard to find out. Signal is a voltage jumping from low (0.1-0.2V) to high (0.8-0.9V) at around 1Hz for the pre cat sensor. The past cat sensor should be stable around 0.5V. That's all for closed loop. In open loop both sensors resp. all four sensors should jump to high.
A much easier way is to look at the parameter readouts, which every dealer should be able to do as Neil already pointed out.
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