U0121
A dead battery, A faulty ABS module, A problem with ABS module circuit, A problem with the CAN bus.
- Audi
- Network
- Generic code
How this code is built
- U
- SystemNetwork
- 0
- Defined bySAE, the same on every car
- 1
- AreaNetwork area 1
- 21
- FaultThe specific fault in that area
Guide
Writing the guide for U0121. The first open of a code takes up to a minute.