i was just wondering if you saw a 1-2-3 code...?

 

since you got a rich/lean code you could also check the ECT sensor this thread shows the resistance values

https://www.matthewsvolvosite.com/fo...ic.php?t=48031

 

I’ll slap a new ect sensor on after the maf, 02 will be next.

Well once I put the maf on and if it’s trustworthy enough to drive to town I’ll check the fuel pressure

 

don't just randomly change parts, TEST the sensor, its easy with a ohm meter.

 

If you got the codes only after running it with the MAF, that isn't surprising. If you clear the codes and run with the MAF plugged in, do they come back? If the code doesn't come back then I doubt it is an issue with the MAF.

If you hear the main pump buzzing while the car is running, your in-tank fuel pump might be bad. When the in-tank pump goes bad it puts a strain on the main pump which causes it to make noise. Check out this site:

In the Tank - 240 Volvo Tank Pump and Sender

It has nicely documented procedures for diagnosing fuel pump issues as well as how to replace it.