2003 330I Error Codes P1083, P1085, P0174, P0171

Hi guys, this is a great forum you have going here.

I recently replaced my valve cover due to it leaking oil on the exhaust manifold shield and now my "Service Engine Soon" light is on. I took the car to the local auto store and pulled these codes from it.
P0171 Bank 1 too leanP0174 Bank 2 too leanP1083 Fuel control limit too lean Bank 1 Sensor 1P1085 Fuel control limit too lean Bank 2 Sensor 1Upon searching previous post on this forum it seems that either I now have an intake leak or I may have fouled my O2 sensors with the silicone gasket sealant I used on the new valve cover gasket.

I plan on checking for an intake leak first as I do not really have a way to check my O2 sensors.

My vehicle is a 2003 330I with 78K miles on it. Any advise you guys could give me beyond that would be greatly appreciated.
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