Audi OBD Trouble Code 44

Oxygen O2 sensor - Lean Mixture

Ignition coil or ignition power transistor unit (cyls. 1 and 4)

An open or shorted condition exists in the engine coolant temperature sensor circuit

1984 logic module diagnostic failure

Battery temp sensor volts out of range
An open or short in the engine coolant temperature sensor circuit or a problem in the PCM's battery temperature circuit.