I have a 2001 S80 2.9, I am new to the forum and need help. I'm currently not driving my car because it has no pick up power for approx 5 seconds then it starts to pick up slowly. The engine vibrations, it sounds horrible. My car was always quiet. It has a wind when I step on the gas peddle. All of this is happening at one time. I just had the MAF Sensor replaced and one of the oxygen sensors replaced Bank 1 Sensor 2. I think it was replaced with the wrong sensor. The MAF code I was getting is gone. But, now I'm getting these New Codes P0300B- Random Misfire Detected, P1172- Manufacturer Controlled Fuel and Air Metering, P0037- Heated Oxygen sensor heater control circuit low Bank 1 Sensor 2, P034- Oxygen sensor circuit no activity detected Bank 1 Sensor 1, and P0136- Oxygen sensor circuit Bank 1 Sensor 2 (See p2270 p2271) Bank 1 Sensor 2 was replaced with a Bosch Premium Oxygen Sensor part#15716 I payed approx $80-90. This is what the sales person at AutoZone looked up and sold to me. But, when I did my own research it looks as thought the heated oxygen sensor cost much more around $190 to $305. But Im not sure.

If I order online, which sensor to get for my problem?
Bank 1 Sensor 1 which sensor to buy for this?
Bank 1 Sensor 2 is the heated sensor?
And I dont know what P1172 means or P0300B, is this the coils or spark plugs. If the coils how many coils do I have and how would I know which one or ones to replace? Help