Audi C123EF0 DTC Clear Repair Remote Service

OBD Online Solution to Reset "Hydraulic Brake Booster Limit Value Reached"

without Opening the ABS for Technicians, Mechanics, Workshops

For many workshops and automotive electronics specialists, models from Audi, VW, Porsche, and Bentley (Vehicles between 2010–2020) consistently set C123EF0 – Hydraulic Brake Booster Limit Value Reached, and even after installing a new vacuum/pressure sensor, the fault remains permanent, and the fault instantly returns after clearing.

Common DTCs

C123EF0 – Hydraulic Brake Booster Limit Value Reached
C123EFO – Hydraulic Brake Servo Limit Reached
15381504 – Hydraulic Brake Boost

Standard diagnostic tools such as Autel, ODIS, Launch, Snap-On, and VCDS cannot erase or reset this DTC. This is due to the fact that this error is software-locked inside the Bosch TRW ABS/ESP module.

Typical Symptoms and real workshop cases include, but are not limited to:

ABS and traction lights are permanently ON, displaying the message: “Brake system fault – stop carefully”
ABS emergency braking is disabled
Booster pressure cannot reach the expected range
The Vacuum sensor was replaced, but the fault remains permanent

ARMHEX offers two professional solutions:

1- C123EF0 Repair by OBD (DoIP) – No opening, No coding, No soldering, Same-day Service

Price: $200

Turnaround time: Same day after contact and booking

2- File Repair Solution (EEPROM Programming)

1- Audi C123EF0 Repair by OBD (DoIP) Remote Online Service

This solution is perfect for workshops that want a quick, clean, plug-and-play C123EF0 DTC counter reset after they fix the issue and replace damaged components.

Benefits of our solution

You don't need to open or remove the ABS module
Resets the internal HBC Activation Limit Counter
Clears C123EF0 / C123EFO / 15381504
No VIN lock
Plug & Play
Does NOT disable the safety system, and only resets the counter
If the vacuum system fails again, the fault will come back as normal (OEM behavior)

Requirements and Tools You Need to Fix Audi C123EF

To repair the ABS module remotely through OBD by our technicians, you need the following tools and requirements.

DoIP cable, or any USB device, or a scan tool that supports the DoIP
PC or Laptop in good condition (Windows 10 or newer)
Stable internet connection

Supported Vehicles (File & OBD)

Audi (2010–2020): A4, A5, A6, A7, A8, S4, S5, SQ5, SQ7 Q5, Q7, Q8

Porsche: Cayenne, Panamera

Bentley: Continental, Bentayga

Lamborghini: Urus

Volkswagen: Touareg

Supported ABS Part Numbers (OBD)

4K0907379
4M0907379
4M6907379
4N0907379
80A907379
8W0907379
Etc.

2- Audi C123EF0 Repair by Dump: Online File Service

For damaged ABS firmware, corrupted counters, or swapped ABS units, this solution can be useful. However, in some cases, online coding and programming will be required.

To proceed, you need to remove the ABS module and send us the EEPROM data.

Common failing part numbers we support

0265956241	8W0907379E
0265291331	8W0907379G
0265256306	8W0907379J
0265956621	8W0907379K
0265955815	8W0907379M
0265255815	8W0907379Q
0265956658	8W0907379AA
0265956840	8W0907379AB
0265956194	8W0907379AC
0265956226	8W0907379AD
0265956659	8W0907379AF
8W0614517N	8W0907379AG
8W0614517H	8W0907379AH
4M0907379K	8W0907379AJ
4G0907379T	8W0614517M
80A907379E

Our service is trusted by mechanics, tuners, workshops, and auto-electronics shops worldwide. We consider all safety steps in programming, so you will not experience any programming issues.

To book your remote service, contact us now!

Email

contact.armhex@gmail.com

WhatsApp

+1 (747) 229 6694

+1 (657) 229 1838

How it works

Step 1: Select the car and the desired service

Step 2: Upload and send us the original ECU file

Step 3: Payment

Step 4: Download new file (Less than an hour)

Start Now