New owner. Code P0390. Please help!

[06 X5]

Good evening everyone! I am a new owner of an 06 X5 4.4i Sport and I am having some issues.

I have wanted an X5 for quite some time now and I finally found a good deal on one that was in my price range, so I picked it up.

It has 120k miles on it and from my research before buying, I knew it was going to need some maintenance issues addressed.

I have replaced the upper timing covers and the valve cover gaskets because the car had a hell of a leak and I was tired of smelling oil. I also addressed many things with the coolant system, i.e. new hoses, thermostat, water pump, upper and lower radiator hoses, and some others things: new belts, power steering hoses, spark plugs, fresh coolant, and oil.

I finished buttoning everything up and went to fire it up for the first time since doing all these repairs. When I started it for the first time, I could immediately tell something wasn't right. Then I got a flashing service engine light. I shut the car off and got a scanner to read the codes.

I got multiple misfire codes and P0392, Camshaft Position Sensor B Bank 2 Low code. At this point, I quadrouple checked all my connections and that all the connectors were seated and making good contact (cleaned them all and added dielectric grease).

I cleared the codes and started the car again. Same result... Very rough idle and sounding like its backfiring followed by the flashing SES. So I shut the car off and checked the codes, multiple misfires again and P0392. Cleared the codes.

I was extremely careful removing the sensor, so I highly doubt that it actually went bad and I know the camshaft position sensor B Bank 2 (drivers side exhaust CPS) is making good electrical contact and is seated down fully on the valve cover. So, I decided to swap the camshaft position sensor A from Bank 1 (passenger side intake sensor). They have the same part number on them so I figured, If the sensor truly is bad, then I will get the code for the Camshaft Position Sensor A Bank 1...

Fired it up again... Not the case, I am now detecting multiple misfires and I am getting code P0390 (Camshaft Position Sensor B Bank 2).

I did notice that the Previous Owner must have attempted to replace the valve covers once before and failed, but while doing so, somehow broke the top of the Eccentric Shaft Sensor on the drivers side. Just the connector part is cracked. I found it like this during disassembly, so I know it was like that before and it ran good... Not great, but I am attributing that to the crappy condition of the plugs that I pulled out. They looked original!

So, any suggestions on what I should do? I really need to get back behind the wheel of my baby!

Thanks in advance for everything,
T.J.