Xhorse Multi Prog Repair Audi G85 Steering Angle Sensor

The Audi G85 steering angle sensor (part number 4M0907129HA, equipped with the D70F4000 chip) is a critical component in modern Audi vehicles. When it fails, drivers may experience warning lights, loss of power steering assistance, or communication errors with the vehicle’s ECU. This article provides a general overview of the repair process based on available repair documentation.

Understanding the Component

The Audi G85 steering angle sensor is responsible for measuring the steering wheel’s position and relaying this information to the vehicle’s stability control and power steering systems. The 4M0907129HA unit uses a D70F4000 microcontroller, which stores calibration and adaptation data. When this sensor fails, it often requires reprogramming or replacement, followed by proper calibration.

Tools and Equipment Required

Before beginning any repair, ensure you have the following:

• A compatible diagnostic tool (such as VCDS, ODIS, or Autel)
• Xhorse VVDI Prog or Multi Prog (both are capable of reading and writing the D70F4000 chip)
• Soldering equipment (if chip-level repair is needed)
• A stable power supply
• Basic hand tools for trim removal

Step-by-Step Repair Procedure

Step 1: Vehicle Preparation

Ensure the vehicle is parked on a level surface with the wheels pointing straight ahead. Disconnect the battery negative terminal to prevent electrical damage during the repair. Wait at least 10 minutes for all systems to power down.

Step 2: Accessing the Sensor

The G85 sensor is typically located behind the steering wheel, integrated into the steering column module or the clock spring assembly. Remove the airbag and steering wheel according to manufacturer specifications. Exercise extreme caution when handling airbag components.

Step 3: Removing the Sensor Module

Once the steering wheel is removed, locate the sensor module. Disconnect all electrical connectors carefully. Note that some modules may have connectors on both sides. Remove the mounting screws and extract the module from its housing.

Step 4: Reading and Writing Data

Using your programming device, read the original data from the D70F4000 chip. Always back up this data before making any changes. If the sensor is being replaced, you may need to transfer the original data to the new unit or perform an adaptation procedure.

Step 5: Reinstallation

Reinstall the repaired or replaced sensor module in reverse order of removal. Reconnect all electrical connectors, ensuring they are fully seated. Reinstall the steering wheel and airbag assembly.

Step 6: Calibration

After reinstallation, the steering angle sensor must be calibrated using a diagnostic tool. Follow the specific calibration procedure for your vehicle model. This typically involves driving the vehicle straight for a short distance while the diagnostic tool monitors the sensor values.

Important Considerations

• Chip Selection: Using the correct chip type is critical. Aftermarket or incorrect chips may not be recognized by the vehicle’s system, leading to starting or communication failures.
• Data Integrity: Always verify that data is written correctly before reassembling the vehicle.
• Battery Voltage: Maintain stable battery voltage throughout the programming process to avoid corrupting the module.
• Professional Assistance: If you are unfamiliar with chip-level programming or airbag removal, seek professional assistance to avoid costly damage or injury.

Conclusion

Repairing the Audi G85 steering sensor requires precise equipment, proper technique, and attention to detail. While the process can be completed by experienced technicians, those unfamiliar with module programming should consider professional service. Proper calibration after repair is essential to restore full vehicle functionality and ensure safety systems operate correctly.

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Xhorse VVDI Key Tool Plus Update Multi-language Database

Xhorse VVDI Key Tool Plus updates the database to support multiple languages.

Supported multi-language list:

English
Thai
Turkish
French
Hindi
Russian
Portuguese
Spanish
Indonesian
Polish
Korean
Hebrew
Italian
Vietnamese
German
Ukrainan
Chinese
Persian

Xhorse Multi Prog Read 2018 BMW MG1CS201 ECU

This article provides a step-by-step overview of reading the engine control module from a 2018 BMW X1 equipped with the B38 engine (Bosch MG1CS201 TC298TP), using the Xhorse Multi Prog programmer.

Before You Begin: Identification Is Everything

Before starting any operation, it is critical to identify the exact ECU part number and software version. Different Bosch ECUs may require different connection methods, pinouts, and reading procedures. Skipping this step can lead to failed communication or, worse, corrupted data.

Step 1: Remove the ECU from the Vehicle

The first step is to remove the ECU from the vehicle and inspect it carefully for damage or previous repairs. Always disconnect the vehicle battery before removing the control module. Once the ECU has been removed, clean the housing and verify the identification labels. Careful inspection at this stage can reveal hidden issues that might affect the reading process.

Step 2: Prepare the Multi Prog Tool

Next, prepare the MultiProg programming tool and make sure the software is updated to the latest available version. Open the software and select the correct Bosch ECU family from the database. Double-check all information before proceeding.

Step 3: Determine the Correct Connection Method

Depending on the ECU version, the reading process may require bench mode or direct connection to the printed circuit board after opening the control unit. Follow the official connection diagram provided by the programmer software. Ensure that power supply voltage is stable and that all communication lines are connected correctly.

A regulated power supply is strongly recommended. Voltage fluctuations during a reading operation can lead to communication errors and may corrupt the data. Before applying power, verify every connection one more time.

Step 4: Establish Communication and Read the ECU

Once the wiring has been confirmed, power on the ECU and establish communication through Multi Prog. The software should recognize the control unit and display identification information such as hardware number, software number, and calibration data.

At this stage, perform a full backup read whenever the option is available. Creating a complete backup before any modification is considered best practice. Store the backup files in a secure location and create additional copies if necessary.

Step 5: Monitor the Reading Process

During the reading process, do not disconnect power, USB cables, or communication lines. Interrupting the operation may result in incomplete data acquisition. Monitor the progress bar and wait until the software confirms successful completion.

Read eeprom.

Read flash.

Read ISN code.

Step 6: Save and Verify Your Files

After the read is finished, save all files with clear names that include the vehicle model, engine type, ECU number, and date. Proper file organization makes future diagnostics and recovery procedures much easier.

It is also recommended to verify the saved data using the software’s built-in validation functions, if available. Confirm that the file size and read status match the expected values for that ECU type.

Xhorse Super Chip XT57 for Toyota Yaris 4D70 All Keys Lost

Here we share one of our customers’ working experience on programming a Toyota Yaris 20019 all keys lost.

It’s blade key Toy47 4D type.

This one no way by obd. Read eeprom and add the key by dump mode.

Eeprom only, you’ve done the hard part getting the box out, read 8 leg, write back and plug in to start.

Did the eeprom, removed the atmel chip, and read the eeprom, he took an Xhorse super chip XT27A transponder and generated one of 2 keys that was in the system, and then wrote back eeprom to the chip, and solder it back, but the car won’t start.

Then also tried XT27B chip, still no lock.

Updated:

He did all with VVDI XT57B super chip.
It didn’t work 1st time , but after 2 attempts all worked as it should.

Tried without writing back eeprom after generating the key, didn’t start.
Wrote it back and it worked.

FYI:

There are two similar boxes. The immo box is very good hidden.
Whole dash has to be removed for the correct immo box.

VVDI Key Tool Plus Disable Ford Alarm without AKL Cable

Xhorse VVDI Key Tool Plus has a new feature to back up eeprom data and generate a universal key to disable active alarm on newer Fords.

It does on some Toyota, it reads eeprom to and then on an XM38 it uses it as emergency, then with another different xm38 will be your “master” key to program in.

No Ford AKL adapter is needed. It reads the memory, modifies it and deactivates the alarm using that method.

It emulates a stored key like Autel does with their emulator; you just use a universal Xhorse smart key in place of the emulator.

Not on all Fords, check device and see if there is such an option.