Volvo 850 B52B2 10 valve 1994

Just to make sure if maybe someone has a similar engine and problems which i got recently, from what I checked the O2 sensor You can put any 4 wire universal sensor instead of the original one. The first 2 wires looking from the left side of the connector on volvo 850 are +12V and ground for the heater, and then the 2 wires for the signal (ground and 5 V for the signal). The heater on both sensors works fine but on none of them original and universal ) there is some fault siganl from the o2 sensor to the ECU cos the car work like .... with it, and without the o2 all is great, but to the auxilary system the burns a lot of gas,

Any guess is it the bad o2 sensor , or some part of ecu got broken = the part risponsible for the communication between ecu and o2 sensor ?

- another question is maybe someone can tell the answer I am in europe and I called the Bosch, NGK- NTK, and they say they got sensor to all engines like B5254 and B5234 but nothing to B5252, the NGK even said they have but they would sell it only to the dealer,

- personally speaking previously i tought the problem with original and universal is just the connector, and u need to cut wires in the universal,

- in volvo 850 the o2 sensor signal gets inputs between 0,75 to 4,75 volts dependind if the mixture is lean or rich, but i heard that all lambde are giving volts from 0 to 1 volt, anybody knows maybe that is just the multiplication done for the ecu on the same idea ???