2002 S40 19T. 150k miles.

odbii showing the following codes:

650 - Control circuit
172 - Too rich Bank 1
101 - MAF VAF circuit
128 - Coolant temp
420 - Catlyst EFF below bank
301 thru 304 Misfire codes for each cylinder.

The O2 sensor and the MAF has been replaced. I found a 1 inch hose un attached, and reattached it. It looks like a hot exhaust return hose. It's the one that connects just under what looks like a second MAF sensor, at the front of the car just above the fan. ...if that makes sense. I cleared the odbii codes.

My question is: should one open hose cause so many codes? I plan to revisit the odbii after about 60 when the sensors set up. Any suggestions or advice would be greatly appreciated.

Thanks in advance

Hmmm!. I guess this is a dead forum.