1999 Volvo S80 O2 sensor (lambda sensor) low voltage?

[Volvo S80]

Hi,
I have an emission system check light (code 42) I scanned the car and the dealer sad low voltage front O2 sensor. He said that I need new sensor, new one is 230 Euro and it did sound a lot to me.
I took the sensor off today and it is Denso 9454595-Volvo 3300.
I found a new one Mobiletron brand for 50 Euro and the sales guy sad that it will work on my Volvo just that i have to set the jack from the old one.

What to do, has any one tried any of those universal sensors?

VOLVO S80 2.4 non turbo 1999 (engine B5244S).

[draser]

That code, p0042, is for the heater circuit of the sensor. I would not replace sensor before doing testing. I'd unplug sensor and using a voltmeter check for voltage on coresponding connector pins of car harness side. If voltage is missing that's your problem. If voltage present I' d check sensor connector pins for heater resistance, same coresponding pins you checked on car harness. If no resistance or short is measured then yes, you do need a new o2 sensor. Wiring diagram needed for connector pin out.