2001 X5 3.0i with Peak Code: 19EEEFE3E4

[spngr311]

Hey everyone, my wife's 2001 X5 3.0i with 90k on it is being very difficult.

First a little history: A few months ago, her X5 started giving us problems. It was the cam position sensors and it worked well for a month or so. Then, about a month ago, her car just died on her on the way to the store. The fuel pressure was low, and I replaced the fuel filter and the fuel pump. Problem appeared solved. She put about 600 miles on it over the next few weeks with no problems.

Then on Friday, it died on her, again. I replaced the spark plugs and cylinder #1 coil. Started up, idled, but then on it's test drive around the block, once the engine reached its normal operating temperature, it died on me. Pushed it home, and read the codes again. This time, it gave the following codes (from the Peak R5/FCX-3):

19: Table
EE: Misfire Cylinder #1
EF: Misfire Cylinder #2
E3: O2 Sensor Adaption Limit, Cylinder #1-3
E4: O2 Sensor Adaption Limit, Cylinder #4-6
19: PreCat O2 Sensor Heater Insufficient, Cylinder #1-3

I changed the pre-cat O2 sensors. It started, idled, but I didn't drive it this time (spent the weekend moving too). After it reached its operating temperature, it stumbled, and died. It gave me the following codes:

19: Table
EE: Misfire Cylinder #1
EF: Misfire Cylinder #2
E3: O2 Sensor Adaption Limit, Cylinder #1-3
E4: O2 Sensor Adaption Limit, Cylinder #4-6

What am I missing? What can I test/check? I am stumped. I reset the codes with the Peak Scanner, but they still come back after it dies. Unfortunately, the codes do not show up on any other scanner, just the Peak one.