Engine management light

[buzz1975]

Hi in desperate need oh help
I have a vovlo V50 on 54reg, the engine management light came on last week, I had some wiring to the inlet manifold sensor replaced and then the inlet sensor, light initially went off.

I drove about 10 miles light came back on, had lamda sensor post Cat replaced, light went out. Drove less than 10 miles when light came back on diagnostics now says the other Lamda is not working and also listed P1130 and P1131 faults which are

volvo P1130 Lack Of HO2S Switch - Adaptive Fuel At Limit P1131 Lack Of HO2S Switch - Sensor Indicates Lean.

I have no other ideas and mechanic at wits end any help please

cheers Simon