Volvo s80 oxygen sensors lambda

[Ibro]

Hello

Had errors show p0131, 134

Changed 2 sensors and the Maf sensor

Still got the same error one day after installing . Cleared it till now does not show again

Reading some solution i saw the plug might ve defective or wiring mismatch

Any idea where can i get a plug that connects to the sensor not the plug on sensor itself

Regards