Originally Posted by RSteckhahn

27C3 - Thermal Oil Level Sensor:

You have to replace your oil level sensor. Cheapest place I've seen it is at www.autohausaz.com brand should be HELLA


2882 - mixture preparation bank 1
2883 - mixture preparation bank 2
2DC6 - fuel tank level, plausibility:

For these three make sure you are filling up premium gas and run a bottle of Chevron Techron fuel injector cleaner.