Audi B4 Quattro Won't Start: Troubleshooting Guide

Hello everyone,

hopefully I'm in the right place
Here's an Audi 80 B4 Quattro with an ABK engine, with 259,753 km on the odometer. The engine runs, but very poorly. The spark plugs, wires, distributor cap, and rotor are all new. The following error codes were read:

00523 - Intake air temperature sensor (G42) 30-00 - Open circuit/Short circuit to positive.
00552 - Potentiometer for air mass meter (G19) 31-00 - Short circuit to ground / Open circuit.
00518 - Throttle potentiometer (G69) 34-10 - No fault code detected - Intermittent.
00525 - Lambda sensor (G39) 28-00 - Short circuit to positive.

Does anyone have any ideas?

Thank you in advance.

Thomas.