In most cases the fault is caused by damage to the laser scanner module's plastic: a single stone chip that cracks its plastic cover is enough.
Most common on the following models:
| Model | Generation |
|---|---|
| Audi A6, S6, RS6 | C8 |
| Audi A7, S7, RS7 | C8 |
| Audi A8, S8 | D5 |
| Audi Q7, SQ7 | 4M Facelift |
| Audi Q8, SQ8, RSQ8 | 4M |
Examples
We can even fix this entirely in software, so the adaptive cruise control works again.
❗ In half of the cases the cause can also be purely electronic, so it can't be determined with 100% certainty just by looking at it. In that case the fault codes have to be read out with a proper diagnostic tool!