OBD2 Diagnostic Tools

 Problem:

Every time I need to insert the Benz BE key Autel IM608 tells me invalid key. I tried 3 different Xhorse VVDI BE keys (yellow board).  Even changed xp400 pro same situation.

Error “The current key is detected to be invalid.”

Solution:

Some BE Key yellow board old version 3.2 come not properly soldered.
BUT the manufacturer is aware of the flaws. There is a new version V4.2 that fixes the issues.

Green and yellow new boards work perfectly normally, something else is the issue.

It seems that it’s your USB cable. Some users had a similar situation.

Change usb cable of the programmer. Use the original USB cable of the xp400 pro, it is enough.

Feedback: 

The usb cable was bad, after changing cable, it works fine.

Tutorial: How to purchase, enable, or activate the commercial vehicle ECU Flash function on Launch X431 diagnostic scanners.

Compatible X-431 heavy duty truck scanners:

Launch X-431 PAD V LINK HD (has ECU Flash function by default)

Launch X-431 PRO3 SE HD

Launch X-431 PRO3 LINK HD

Launch X431 V+ Smartlink HD

Launch X431 Pro3s+ Smartlink HD

ECU Flash Function Including:

• Supports full-range Cummins engine ECU flash (read/write) (China III, IV, V, and VI emission standards)

• Supports Bosch system:

• ECU data flash for China III-VI engines

• Low-level (boot mode) flashing

• Cross-version engine flash without physical disassembly

• Sinotruk system coverage:

• CBCU/CBCU3 modules

• 2012 instrument cluster variants

• BBM and VCU units

• Proprietary SCR system

• Delphi system support:

• Unit pump ECU flash

• Full-range engine data flashing (China III-VI)

• Nanyue unit pump ECU flash (R01/R02 models)

• Yuchai proprietary system flash

• Denso ECU solutions:

• Hino/Shanghai Diesel/Wuxi Diesel/Dongfeng/Sinotruk series

• Foton vehicle systems:

• Instrument cluster combinations

• Smart BCU modules

• AMT control units

• CBCU3 flash

• Weichai and Wuxi Diesel proprietary systems:

• Complete engine data flash (China III-VI)

• Natural gas system support:

• Woodward/WPDS systems

• Bosch EGC4

• Sinotruk-Yuchai-Wuxi Econtrols

• Yuchai proprietary NG systems

• OH6 platform

• Aftertreatment DCU coverage (20+ systems):

• Tenneco/Sanli/Kelong/ACM/Tianlan

• Dinex/Kedes/Henghe/Qintai/Weifu

• Bosch and other major brands

• Dongfeng Commercial Vehicles:

• OEM-grade online matching

• China VI compliant data flash

1. How to Purchase ECU Flash License?

Go to Mall- Software Store- Commercial Vehicle- ECU Flash.

Enter purchase and delivery information and choose payment method.

2. How to Enable/Configure ECU Flash Function?

Follow this guide to modify configuration files to enable ECU flash function.

• PAD V LINK HD path: /storage/emulated/0/cnlaunch/X431PADV/assets/StdCfg.ini
• PRO3 SE HD/ PRO3 LINK HD/ V+ HD/ Pro3s+ HD path: /storage/emulated/0/cnlaunch/X431Pro3S/assets/StdCfg.ini  

Parameters to Modify: OnlineFlash=0, Flash=0.

For PAD V HD, go to Other Modules – Files – file management (internal storage) – cnlaunch folder -Device name – Assets directory and find the file named Stdcfg.ini.

For Pro3 HD series, go to Other Modules – Files – file management (internal storage) – emulated-o-cnlaunch folder -Device name – Assets directory and find the file named Stdcfg.ini.

Open and edit “StdCfg.ini” with a text editor, find two fields “OnlineFlash=0” and “Flash=0”, click the corresponding field, change the value to 1, and save. After the save value, the corresponding value will change to 1, as circled in the figure below, indicating that the software now can do ECU Flash function.

Find OnlineFlash and Flash
Change OnlineFlash=0 to OnlineFlash=1
Change Flash=0 to Flash=1

NOTE:

1.Changing OnlineFlash and Flash value to 1 will also enable online programming function (if it’s PAD series)

2. If there is no OnlineFlash or Flash parameter, add OnlineFlash=1; Flash=1 parameters directly to the end of the StdCfg.ini document.

3. Display in the APP

After modifying the parameters (OnlineFlash=1, Flash=1):

X-431 HD APP:

• “ECU Flash” software appears under Local Diagnosis / Manufacturer.

• “ECU Flash Data Management” function appears in the More section.

X-431 APP:

• “ECU Flash” software appears under Local Diagnosis / HD / ALL.

• “ECU Flash Data Management” function appears in the Tools section.

CG FC200 ecu programmer released new software upgrade on July 16th, 2025.

• Adds DTC OFF for more ECUs
• Adds idle speed adjustment for more ECUs
• Adds new protocols

V1.2.9.3   NEW
(2025.07.16)

Update content:

1. Added DTC-OFF function, fourth batch of models:

VAG：MED17.1, MED17.1.1, MED17.1.6, MED17.1.21、MED17.1.27, MED17.5, MED17.5.2, MED17.5.5, MED17.5.21, MED17.5.25,  MED9.1, ME7.5.10, ME7.5.20, ME7.5.30, MG1CS008, MG1CS001, MG1CS111, MG1CS002
Mercedes：SIM271DE, SIM271KE
PSA: MED17.4, MED17.4.2, MED17.4.4, MD1CS003
Land Rover：EDC17CP42, EDC17CP55, MEDC17.9
Porsche：SDI4, SDI6, SDI7, SDI8, SDI9, SDI21.x
Volvo：EDC17CP22, EDC17CP48
Honda：EDC17CP16
BMW：EDC17CP45
Iveco：EDC17CP52
Jeep： EDC17CP27
Fiat：EDC17CP52, ME17.3.0
Renault：MD1CS006
CNH：EDC17CV41
Man：EDC17CV42
Alfa Romeo： MED17.3.3


2. Added "Idle speed modification" function for vehicle models

Honda：
37820-Rxx-Hxx SH7058
37820-5xx-Bxx SH72543

Hyundai-Kia：
ME17.9.11, ME17.9.1, ME17.9.11.1, MEG17.9.12, MEG17.9.13, MED17.9.8, MEG17.9.8, MEG17.9.21, SIM2K_140, SIM2K_141, SIM2K_341

3. New ECU models added：
JBC/JAC：LINCONTROL LEC4AF、LEC4AP
BAIC/Dongfeng/Geely/Changan/Proton：BOSCH MG1UA008、UP8
DFM-Future：AECS FC-34
VAG：CONTINENTAL Simos8.6
Dongfeng：MD1CC878
Fukuda：MD1CS089
Buick：ME17.U.6
FAW/Jiangling Motors：MD1CE108
BYD/Haima：M7.9.7, M7.9.7.1, ME7.9.71


Bug fixes:
1. Optimize the issue of failed PFlash writing in Wuling Easy-U3.6
2. Optimize the issue of reading and writing failures in some parts of Wuling Easy-U2.5 and U2W

 OBDSTAR released new MITSUBISHI, VAG and Fiat IMMO software in July 2025.

Compatible tools: OBDSTAR X300 Classic G3, X300 Pro4

VW [Version: V45.53]

1. Add Read IMMO DATA function (by VW4-AKL cable) for below model:

   • VW TIGUAN NEC+95320 873B

2. Add proximity key programming function (by C4-06, supported AKL) for below models (which supports online synchronization code calculation):

   • VW MOB48-5A D70F3529-V2

   • AUDI MOB48-5A D70F3529-V2

   • Skoda MOB48-5A D70F3529-V2
   • Seat MOB48-5A D70F3529-V2

3. Optimized software.

FIAT [Version: V43.15]

1. Add Manual Select System BSI (PRE-CODING) CONTINENTAL MPC5606B (ID4A) Show IMMO Info TYPE 2.

2. Optimized software.

MITSUBISHI [Version: V41.04]

1. Add proximity key programming (All Keys Lost), Read PinCode functions for below models (by C4-06):

   • AUSTRALIA OUTLANDER (GM#) 2021-

   • CHINA OUTLANDER 2021-

   • EUROPE OUTLANDER (GM#) 2021-

   • JAPAN OUTLANDER (GM#) 2021-

   • NORTH AMERICAN OUTLANDER (GM#) 2021-

   • OTHER OUTLANDER (GM#) 2021-

2. Add proximity key programming (Supported AKL), Read PinCode functions for below models (by C4-06):

   • OTHER L200 2023-

   • AUSTRALIA L200 2023-

   • NORTH AMERICAN L200 2023-

   • JAPAN L200 2023-

   • EUROPE L200 2023-

   • CHINA L200 2023-

 What is ECUDesk?

It is a program for editing car control unit files (ECU chip tuning).

There are 3 versions of ECUDesk chip tuning software:

What are subscriptions and how do they differ?

ECUDesk Standard vs Premium vs HP+ Version

1. STANDARD – this subscription allows you to edit the firmware of the car in terms of disabling environmental standards and has a limit on the number of successfully downloaded files of 20 pieces per day. (20 files per day)

2. PREMIUM – subscription allows you to edit car firmware in terms of disabling environmental standards, has additional functions: turning off the immobilizer, removing the speed limit, disabling system readiness monitoring, disabling the start/stop system. There are no restrictions on the number of downloaded files per day. (No file limitation).

3. HP+ (horsepower) – the subscription includes all the features of a premium subscription, plus the HP+ subscription allows you to identify the stock file downloaded by the client and increase its power and torque*. (Supports Stage 1)

*ECUDesk supports increasing the capacity of only the files that are in its database and are declared in the list of supported control units. If this file is not available, the user can send it to support and the service will add it to the program in 24 hours.

The cost of programs and the cost of an annual subscription

1. STANDARD – $1000
2. PREMIUM – $1,300
3. HP+(horsepower) – $1,500

Annual subscription:
1. STANDARD – $200 per year
2. PREMIUM – $300 per year
3. HP+(horsepower) – $500 per year

Cost of transition:
1. Transition from STANDARD to PREMIUM – $300
2. Transition PREMIUM to HP+(horsepower) – $200

*The price is subject to change and is valid until 01.11.2025.

Here’s a small tip to guide you quickly check and sync vehicle mileage on CGDI K2 key tool. You’ll need to have a working key at hand.

Put the working key into CGDI K2 key clot.

Select Chip Identification Copy function.

Insert a BMW key into the induction coil and identify key information.

CGDI K2 reads key info. It’s ID49 chip key. Hit “More” button.

CGDI K2 will show mileage. Click “Edit” function.

Input mileage you need to sync manually.

Identify key info again. Now you can see the mileage is synced.

 In this guide, we’ll walk through the process of reading the CS and PIN code for a Skoda Rapid all-key-lost using the OBDSTAR DC706 tool. This method is particularly useful when dealing with immobilizer and key programming issues.

Step-by-Step Procedure

1. Connect the DC706 Tool

• Select Simos PCR 2.1 Protocol

• Check bench wiring diagram with MP001 or P003+

• Connect ECU with P003+ and DC706

• First connect ECU and read ECU info. It reads ID successfully.

• Navigate to the "Read IMMO Data" option in the DC706 menu.

• The tool will connect to the server to retrieve the CS and PIN code.

• Once the PIN is extracted, take a screenshot for reference.

Now you can program key with the CS and PIN code.

Topdon Rlink X7, VXDIAG VCX SE and Eucleia T6 Pro which is a better J2534 passthru device for OEM online programming?

Check the comparison below:

Good news! Launch X431 now supports VAG SFD security gateway unlock automatically. Don’t need to obtain a token from 3rd party.  You have to purchase SFD unlock subscription.

How to Purchase Launch X431 VAG SFD Unlock License?

VAG SFD authorization is now available as a standalone purchase.

Compatible devices:

Launch X431 PAD V7 Elite
Launch X431 PAD V
Launch X431 Pro5 Smartlink
Launch X431 Pro3 (Pro3s+ Elite)
Launch X431 Pro3 (V+ Elite)

Launch X431 Pro V+ V5, Pro Dyno etc 10 inch/8 inch tablets

Launch CRP919E BT/CRP919X BT

Price: $299

Tax is not included.

Payment:

Via Paypal

Applicable regions and countries:

Excluding the following areas: Europe (Eurozone regions, as well as Spain and Portugal), the United States, Canada, Mainland China, Syria, Russia, Belarus, and North Korea. All other regions or countries are eligible for purchase.

Purchase path:

Navigate to Mall-> Other Goods->VAG SGW.

Interface styles may vary across different devices.

The authorization is valid for one year ONLY. Need to renew license after expiration.

For regions where individual software purchases are unavailable, only SGW software packages are available for purchase. User access must be differentiated between European and non-European markets.

For European Users:

Purchase “European SGW Function License” in Mall. ($1,151 + tax).

Contains:

FCA & Maserati gateway license (1 year)
Mercedes Benz gateway license (1 year)
Renault & Dacia (20 connections)
VAG SFD license (1 year)- newly added

For Non-European Users:

Purchase “European SGW Function License” in Mall. ($899 + tax).

Contains:

FCA & Maserati gateway license (1 year)
Renault & Dacia (20 connections)
VAG SFD license (1 year)- newly added

*The authorization is valid for one year ONLY. Need to renew license after expiration.

Non-European users cannot activate Mercedes gateway license on their devices.

NOTE:

Please note that this item is only available to non-European region users, so please do not purchase if you are a European region user.

Users must log in to this website: http://europe-lmp.x431.com/LMP/#/sgwLogin for SGW authentication first, otherwise the function cannot be activated successfully.

FYI:

Launch X-431 FIX/CarSet PRO/HaynesPro can be purchased in Mall as well.
Go to Mall- Other Goods- European Database License. It takes $1,915 (tax is not included)

 When performing the BMW F/G series mileage correction function using the APPRO2 programmer, it will request a check code.

In the past, users had to send the random code to us to get the check code.

The time difference makes this inconvenient.

Now APPRO2 technician modifies the online server. Users will obtain the check code online directly.

How to get the check code automatically?

Update Appro2 software to latest version.

This function requires network connection.  The software will calculate the check code from APP2 server.

NOTE:

The server has a daily limit of 5 check code calculations. Additional requests must be calculated manually.

OBDSTAR X300 Classic G3 read and write VW MED17.1.27 ECU on bench with MP001 programmer. 

Bosch MED17.1.27

Read/Write EEPROM-Success

Read/Write Flash-Success 

IMMO Off-Success

IMMO Off directly from G3, No Third Party Required

Automatic Checksum Correction

Total Time: 16 Minutes

 OBDSTAR DC706 will read and write Hyundai KEFICO CPEGP3.20.1 ECU on bench mode.

Tools required:

OBDSTAR DC706

OBDSTAR P003/P003+/MP001 programmer

Select Hyundai KEFICO CPEGP3.20.1 C277TP ECU

Bench mode with P003 or MP001

Check bench mode wiring diagram.

Connect P003+ adapter with ECU and DC706.

Connect ECU.

Read MAPS. 

It also write MAPS data without problem.

 Q: There is a “Unlock DME” feature in Yanhua Mini ACDP module 38 BMW BDC2 function menu. What does unlock DME mean? Does it refer to engine ECUs blocked after 2020/10?

Here is the clue.

What is Unlock DME?

If a DME is unlocked, you can rewrite immo data to the engine.
If you get a second-hand engine DME, you can install it on other cars after unlocking it.

Compatibility:

Unlock DME is available for B48/B58 engines (F chassis and G chassis) that can read engine EEPROM data by Yanhua ACDP.

Requirement:

Unlock DME function requires A504 license activation.

Operation mode:

Unlock DME is done via OBD.

Procedure:

First of all, read and back up EEPROM data from original DME first.

Read B48 EEPROM data with module 3+ B48 interface board on bench mode.

Then select “Unlock DME” function.

Connect ACDP with vehicle OBDII port.

Upload original eeprom data and follow ACDP prompts to unlock DME until completed.

 User reported: program Volvo XC70 all keys lost with OTOFIX IM2 successfully.

Need to remove CEM module from vehicle.

Check wiring diagram in device.

Ready to read CEM data with OTOFIX XP1 Pro.

Make new key successfully.

 OBDSTAR DC706 read and write BYD Delphi MT22.1 Denso ECU on bench successfully.

I’ll walk through my experience reading and cloning a Denso MT 22.1 ECU using the Obdstar DC706 tool. This process involves bench reading, VIN writing, and troubleshooting common issues—helpful for locksmiths, mechanics, and automotive enthusiasts.

Step-by-Step Process

• The Denso MT 22.1 ECU was initially attempted with Xhorse Multi prog, but it required boot mode, which was unnecessary with the Obdstar DC706.

• Using a K-line connection, the Obdstar successfully established communication with the ECU.

• The reading process was slow due to the K-line protocol but stable.

• The tool first writes a bootloader before extracting the flash data, ensuring compatibility.

• A key advantage of the Obdstar DC706 is its ability to read and write VINs, useful for virgin ECUs or replacements.

• The new ECU had no pre-written VIN, so the plan was:

  1. Read and save the flash data for future use.

  2. Write the correct VIN if the original ECU couldn’t be read.

• Avoiding physical opening (desoldering) was preferred to preserve the ECU’s integrity.

• If the original ECU couldn’t be read via bench mode, boot mode (desoldering) would be the fallback.

• The saved flash data from the new ECU could be reused for future cloning jobs.

 

 

 

 

 

 

 

 

Key Observations

Obdstar DC706 Benefits:

• Works without opening the ECU (bench mode).

• Allows VIN writing, essential for new or replacement ECUs.

• More user-friendly than Multiprog for this application.

Challenges:

• Slow reading speed due to K-line communication.

• Boot mode may still be needed for problematic ECUs.