Both Keydiy KD-X4 5-in-1 key programmer and CGDI A2 can add new key to BMW G chassis B DC2 system. What is the difference between them? Which one is better?
Check the detailed comparison below
| Item | Keydiy KD-X4 | CGDI A2 |
| Image |  |
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| Operation | Based on App or PC software | Tablet, Standalone |
| Primary Focus | Universal key/remote recognition, remote generation, copying, simulation, key programming | IMMO matching, key programming for specific brands; frequency detection |
| Connection | Bluetooth/OTG to mobile/tablet (KD App); USB to PC; USB | WiFi, USB |
| Language | App supports Multilanguage, 19 languages | English, Chinese |
| Subscriptions | No annual subscription. Points/tokens for advanced functions (e.g., BMW add-key: 200 points/$4); app-based license purchases | No Annual Subscription. Optional Mercedes FBS3 license; free daily tokens for some functions |
| Vehicle brands | 56+ brands | Supports password-free and disassembly-free matching for most vehicle models. |
| Detect frequency | Yes | Yes |
| ID48 96bit cloning | Yes, 100 KD coins or 10 USD per calculation | – |
| BMW Immobilizer | Yes, BMW CAS1-CAS4, FEM/BDC, BDC2, BDC3. FEM/BDC, BDC2 and BDC3 require same license. 5000KD coins or 150USD. | Yes, CAS1-CAS4, FEM/BDC, BDC2 (Not yet support BDC3) |
| Benz Immobilizer | – | With FBS3 license. Supports EIS, calculate password, Read/write key, Benz ELV, ECU and gateway functions. |
| VAG MQB48 & MLB | Yes, need to activate MQB48 and MLB license. Each MLB add key require 200 KD coins. | MQB48 yes, MLB No |
| Audi BCM2 encrypted key programming | Yes, 2500KD Coins/75USD to activate license | – |
| Volvo CEM | Yes, 3500 KD-Coins/50USD to activate license | Yes |
| Toyota 8A Blade key AKL | Yes with 8A blade key AKL cable | Yes |
| Toyota 8A smart key programming | Yes | Yes, Toyota 8A/4A smart key |
| Jaguar Land rover 2018-2024 Key programming | Yes, supports JPLA / K8D2 / J9C3 / M9R3 systems | – |
| BYD all keys lost | Yes, 100 KD coins each time | Yes |
| Program Toyota second hand key without unlocking | Yes, 200 KD coins or 5 USD | – |
| Generate remote | Yes, generate KD remote | – |
| Remote Unlock | Yes | – |
| Yamaha ID47/ID49 motorcycle key barcode retrieval | Yes | |
| Nissan B18 28-digit pin code | Yes | With 40-PIN cable to bypass pin code. |
| CAN FD protocol | Yes | Yes |
In conclusion:
KD-X4:
- Pros: Better for newest BMWs (BDC3), wider brand support (56+), strong on remote generation, multi-language app.
- Cons: need to pay-per-use tokens for many functions, no Mercedes support, needs a phone/tablet to work.
- Pros: Excellent for Mercedes, built-in tablet (standalone), often cheaper per job with free daily tokens.
- Cons: No BMW BDC3 support, fewer languages, weaker on VAG MLB systems.
Recommendation:
Choose KEYDIY KD-X4 for latest BMWs, variety of brands, and remote generation.
Choose CGDI A2 key programmer for Mercedes focus, standalone convenience, and common immobilizer jobs.
It’s recommended to choose both devices for more vehicle coverage and functionalities.