Yikes...

About two months ago got these three codes:

P0130: Before-catalyst oxygen sensor, electrical: Nernst-cell resistance or ceramic temperature implausible, wiring or heater fault

P2243: O2 Sensor Reference Voltage Circuit Open (Bank 1 Sensor 1)

P0030: HO2S Heater Control Circuit (Bank 1 Sensor 1)



Replaced the precat O2 sensor and expected the CEL to go away. After a few days the code didn't and I went and got a new read:



P0130: Before-catalyst oxygen sensor, electrical: Nernst-cell resistance or ceramic temperature implausible, wiring or heater fault

P2243: O2 Sensor Reference Voltage Circuit Open (Bank 1 Sensor 1)

P0030: HO2S Heater Control Circuit (Bank 1 Sensor 1)

P0300: Random, Multiple Cylinder Misfire Detected
P0304: Misfire Detected in #4 Cylinder

P0303: Misfire Detected in #3 Cylinder

P0300: Random, Multiple Cylinder Misfire Detected

P0304: Misfire Detected in #4 Cylinder

P0303: Misfire Detected in #3 Cylinder



Yikes. Put in a tank of gas, and about 40 miles into it I'm still receiving the CEL. Tried to clear the codes and they came back the next time I started the car. It's a 08 Mini Cooper S auto with 34k miles.

I'm experiencing no noticeable lack of power. No hesitation, nothing.

Any remote idea what's going on?