Car OBDII diagnostic tool, odometer correction tool, ECU chip tuning tool, car key programmer, OBDII software technical support center.
Problem:
I’m having issue with BMW BDC3 cloning using Keydiy KD-X4 programmer, software is up to date , works on pc software but not iPhone.
Solution:
It is ios issue not your device.
That error comes when data package not syncing correctly on iphone.
Try delete app and reinstall then download data again.
Also check version because ios usually behind android updates.
If still same use android for bdc3 it works more stable.
iPhone doesn’t get update till way later try on android will work.
Xhorse VVDI Key Tool Plus is about to release a new upgrade that allows modifying the ID of original MQB49 5C and 5D keys. The testing feature is currently available (check test feature 187).
The official release is coming soon. Please pay attention to the device upgrade information.
How to modify original MQB49 5C/5D key ID with key tool plus?
Can used keys be reused?
Yes, that was already the case, but now you can change the ID.
It will modify both brand new and used OEM key’s ID.
When writing to original (OEM) key, it will come up just before writing.
Review:
New update soon available to change 5D/5C ID OEM keys, tested on 5D black coil.
Problem:
After reading a Skoda MQB49 5C key with keydiy kd-x4, the chip no longer recognised. Anyone had similar issue? The coil copper wire affects the chip recognition?
Solution:
This is common on VAG MQB49 5c keys.
The coil is directly related to chip communication so if it is damaged or loose the chip will not be recognised.
Check if the copper coil wire is broken or lifted from the board.
Also check continuity of the coil with multimeter.
If coil is ok then likely chip got damaged during reading.
These boards are very sensitive so even slight overheating or pressure can kill the chip.
You need to be very, very careful when opening up these keys.
All keys with coil on the board if the damaging induction coil is no longer recognised. Replace the induction coil with another good one from a New key and after îs recognised.
It happened to me too. I just brought a key from a disabled car and replaced the key coil. Replaced the coil with another.
Problem:
Autotuner has a problem reading EDC17 ECUs (i.e edc17c18 bench, no connection error.). It works via OBD ok but not bench.
Tested ECU with another tool and works.
Open the circuit board and found this component is burnt.
Which component needs to be changed?
Solution:
SOD128 3A 30v diode is burnt, also check MOSFET on the bench output.
The MOSFET is located inside Autotuner, next to the socket.
It happens when you touch red or pink wire to ECU body (minus ) and you are not used power supply with protection.
Replace the faulty MOSFET diode solder it directly with a 10amp fuse as well. Saved many times by fuse.
NOTE:
Autotuner programmer has 5 years guarantee. The best way is to open a ticker with Autotuner. They will unlock an Autotuner-specific diag operation, do all of them and measure everything.
If the self check psu thing inside of autotuner software did not work, send everything in for inspection and repair.
Send it back to autotuner they will repair it / replace board. Paid for a flat rate repair which is the cheaper one, got your device back with new ports and everything. Opened it up and got actually a new pcb (so new device with the old shell).
This is way cheaper and with less hassle.
VAG DQ38x 2022+ (401 Bootloader): The solution is here!
Have you been waiting for a solution for the infamous 401 bootloader on the latest Golf 8, Formentor, or S3? It’s now fully supported on AutoTuner!
Affected TCU Identification:
Method: Bench Unlock then Flash via OBD!
Hardware: A new dedicated DQ38x cable is available (Note: not required if you already own the AutoTuner DSG Kit!).
Take control of the shifting performance on the latest 2.0 TSI and 2.0 TDI engines.
Key Features:
Type: Transmission Control Unit (TCU)
Mode: BENCH NR, OBD VR
Readout (OBD): Calibration
MCU: SH72549
Read time (BENCH): 3min 30sec
Write time (BENCH): 30sec
Write time (OBD): 1min 30sec
Checksums correction
Back to stock function (OBD only)
Backup creation (BENCH only)
Compatibility List*:
Audi Models: A1 (2018) / A3 (2012 – 2019) / A4 (2008 – 2018) / A5 (2011 – 2016) / A6 (2011 – 2018) / Q2 (2016 – 2021) / Q3 (2011 – 2018) / Q5 (2012 – 2017) / S3 (2020) / SQ2 (2018) / TT (2018) / TT S (2018)
Audi Engines: 2.0 TSI / 40 TFSI (2.0) / 2.0 TDI CR EU6 / 2.0 TFSI OPF / 40 TDI (2.0) / 40 TFSI (2.0) EU6d / 2.0 TSI EU6d / 45 TFSI (2.0) / 2.0 TSI R EU6d / 2.0 TFSI (S) EU6d / 45 TFSI (2.0) EU6d
Cupra Models: Ateca (2019) / Formentor (2020) / Leon (2020)
Cupra Engines: 2.0 TSI EU6d / 2.0 TDI CR EU6 / 2.0 TSI VZ / 2.0 TSI
Seat Models: Alhambra (2015) / Ateca (2016 – 2020) / Leon (2013 – 2020) / Tarraco (2019)
Seat Engines: 2.0 TDI CR EU6 / 2.0 TFSI OPF / 2.0 TDI CR EU6.2 / 2.0 TSI EU6d / 2.0 TSI FR
Skoda Models: Karoq (2017 – 2022) / Kodiaq (2017 – 2023) / Octavia (2013 – 2020) / Superb (2015 – 2019) / Yeti (2008 – 2014)
Skoda Engines: 2.0 TDI CR EU6 / 2.0 TFSI OPF / 2.0 TDI CR EU6.2 / 2.0 TSI EU6d / 2.0 TSI / 2.0 TSI RS / 2.0 TSI EU6
Volkswagen Models: Arteon (2017 – 2020) / Atlas (2018) / Caddy (2015 – 2021) / Coccinelle / Beetle (2011) / Golf (2012 – 2024) / Golf Sportvan (2014) / Jetta (2010 – 2018) / Lavida (2018) / Passat (2015 – 2023) / Passat CC (2013) / Polo (2021) / Scirocco (2014) / Sharan (2015) / T-Roc (2017) / Talagon (2021) / Taos (2020) / Tavendor (2022) / Tayron (2018) / Teramont (2018) / Tharu (2018) / Tiguan (2016 – 2021) / Touran (2016) / Viloran (2020)
Volkswagen Engines: 2.0 TDI CR EU6 / 2.0 TFSI OPF / 2.0 TDI CR EU6.2 / 2.0 TSI R / 2.0 TSI EU6 / 2.0 TSI EU6d / 2.0 TFSI EU6 / 2.0 TSI / 2.0 TFSI (ClubSport) / 2.0 TSI GTI / 2.0 TSI R 20 Years / 2.0 TSI (GLI) / 2.0 TSI EU6 (380) / 2.0 TSI 4 motion / 2.0 TSI R EU6d / 330 TSI
*The list may evolve over time.
How does it work?
Unplug the TCU Connector.
Connect Autotuner DSG adapter with TCU.
You can either perform Bench read/write operations or apply the OBD unlock patch.
Bench
Normal read
Read time: 3min 30sec
Write time: 30sec
Backup creation
OBD
Virtual read
Write time: 1min 30sec
Back to stock function.
More and more devices can now add keys for VAG Porsche 5C and 5D systems. Among the more popular ones are XHORSE, KEDYI (KeyDIY), Yanhua ACDP, and AUTEL. Which device performs better for 5C/5D keys? Below are the respective features to help you choose the right tool.
Cons:
Instruction: How to add MQB49 5C/5D key with Xhorse?
Cons:
Pros:
Cons:
Instruction: How to add MQB49 5C/5D key with Autel IM508/IM608?
In sum:
Yanhua ACDP is the most “traditional” choice but also the most expensive to run. It requires purchasing specific authorizations and adapters, and you must use original factory keys for both 5C and 5D systems. If you already own an ACDP and don’t mind the higher key cost, it works reliably — but it’s rarely the first choice for cost-conscious users.
XHORSE offers excellent value with a free software upgrade and no need for extra authorizations or cables for basic operation. It supports its own affordable keys for 5C systems (a big plus), and can unlock the SFD gateway (though still via third-party token). The main drawbacks are the inability to extract the CS code and the limitation that you can only edit the ID on XHORSE keys, not originals.
AUTEL stands out for its user-friendly interface — clean, direct menus that many technicians love. The upgrade is free and requires no special adapters. Like XHORSE, it supports its own keys for 5C and originals for 5D. SFD unlocking is possible but still depends on third-party or AUTEL-purchased tokens. The limitations are the same as XHORSE: no CS code extraction and no ID modification on factory keys.
KEYDIY (especially the KD-X4) has made the biggest leap recently. The latest software update allows the device itself to obtain the SFD unlock token directly — no more contacting third parties or waiting for tokens. This is a major convenience upgrade. It supports affordable KD keys for most 5C and 5D applications (only 5D UWB needs originals), and the process is reported as very stable. The downsides are the need for software authorization, a modified adapter or DB25 cable/card board, and the current inability to change original key IDs (though an upgrade is expected soon). Like the others, it provides a service code instead of a full CS code.
Final Recommendation:
If you want maximum convenience and the least dependence on third parties right now → KEYDIY KD-X4 is currently the strongest contender, thanks to its built-in SFD unlock capability and direct token generation.
If you prefer simplicity and a clean interface with no extra hardware → AUTEL is a solid, user-friendly option.
If you already work heavily in the XHORSE ecosystem and want to use cheaper keys for 5C → XHORSE remains very competitive.
Yanhua ACDP is best reserved for users who already have the full setup and don’t mind higher running costs.
Ultimately, the “best” device depends on your existing tools, budget for keys/adapters, and how often you handle SFD-protected vehicles. Many professional locksmiths now keep at least two of these (especially KEYDIY + XHORSE) to cover all scenarios.
http://blog.obdii365.com/2026/03/24/keydiy-vs-xhorse-vs-autel-vs-yanhua-acdp-for-vag-mqb49-5c-5d/
Keydiy KD-X4 key programmer released new software upgrade on March 24th, 2026.
Supports unlocking VW Audi Sear Porsche SFD1 security gateway within the device automatically.
The device can now directly obtain the SFD unlock token, eliminating the need to contact a third party for an unlock code like before.
It comes with a built-in unlock code calculator. Each calculation costs 200 K-coins or 5 USD, with no daily usage limits.
This saves you the hassle of dealing with third-party unlock services. The price is also more affordable.
NOTE:
It will unlock SFD1 gateway only. It cannot unlock SFD2 SGW yet.
Upcoming updates:
Disable Ford active alarm by OBD
Modify BAG MQB49 5C/5D original key ID
