Outdoor temperature signal, implausible reading

Hello everyone,

I have an Audi A6 AFB manufactured in 1999 with the following problem:
When starting the car, if the outside temperature drops below approximately 8 degrees Celsius, the car beeps three times and... (the sentence is incomplete).
The brake warning light and the traction control system (ASR) light illuminate for approximately 3 seconds.
After it runs for about half a minute, the problem doesn't occur anymore.
There is no error in the memory (brake).
However, there is an error in the memory (engine), specifically: The outside temperature sensor is sending an implausible signal (error code 00667 027).

Please help me.

Richard.

Battery voltage too low during start-up!

Just ignore it!

The problem has nothing to do with the external temperature sensor error!

Regards,

Manuel.