The Bosch KTS 540 is a wireless VCI paired with ESI[tronic] software for advanced vehicle diagnostics, supporting functions like module coding, Pass-Thru, and integrated multimeter testing. While providing robust 100-meter Bluetooth connectivity, the KTS 540 faces discontinuation of support after the ESI[tronic] Evolution 2025/1 release, limiting future updates for current users. For technical details and troubleshooting, see the Hickleys .