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Brake Warning:
C123EF0 indicates a brake boost or ABS system fault. Ignoring this can compromise braking performance and vehicle safety.
What Is C123EF0?
C123EF0 is a fault code for the Audi A4 indicating a brake boost / ABS module issue. It can affect brake assistance, ABS, traction control, or high-voltage braking in hybrid models.
Common Causes
- Faulty ABS / brake boost module
- High-voltage brake booster errors in hybrid/e-tron models
- Wiring harness damage or corroded connectors
- Low brake fluid or hydraulic leaks
- Communication errors with ECU / TCU
Symptoms
- Red brake warning light illuminated
- Limp mode on braking system
- Pulsation or reduced braking power
- Error code C123EF0 on diagnostics
- ABS / ESP warning lights
Our Repair Solutions
We specialise in Audi A4 C123EF0 fault diagnostics and repair across London. Our service includes ABS / brake boost module reconditioning, wiring checks, hydraulic system inspection, and full system testing to restore safe operation.
Questions About C123EF0?
Our specialists are ready to assist — don’t hesitate to get in touch.
📞 Call 07779 836677