Manufacturer: VAG (VW, AUDI, SKODA, SEAT)
Brand: BOSCH
Model: MED17.5.21
Function: Immo off
Emulator: No
Bosch MED17.5.21 Immo off: VAG ECU immobilizer delete guide
The Bosch MED17.5.21 ECU is widely used in 1.2 TSI engines across popular VAG models such as the Audi A1, Volkswagen Polo, Skoda Fabia, and Seat Ibiza. If you’re replacing the ECU, dealing with lost keys, or testing on the bench, disabling the immobilizer (IMMO OFF) can save hours of troubleshooting.
This guide walks you through how to remove the immobilizer from MED17.5.21 using the CKDecode immo off file service platforms —no emulator required.
Whether you’re a workshop technician or an enthusiast, the process is safe, fast, and fully reversible. We’ll cover supported vehicles, key fault scenarios like DTC P1570, and a step-by-step procedure to complete the IMMO OFF process with confidence.
Supported vehicles for Bosch MED17.5.21
The Bosch MED17.5.21 ECU is commonly installed in the following VAG models, particularly those equipped with the 1.2 TSI engine:
- Audi A3 1.2/1.4 TSI (2013–2018)
- Volkswagen Polo 1.0/1.4 TSI (2009–2017)
- Skoda Fabia Mk2 1.2 TSI (2010–2014)
- Seat Ibiza 1.0/1.4TSI (2008–2017)
Immo off procedure for Bosch MED17.5.21 using CK Decode
To proceed with MED17.5.21 immo off process using CK Decode, follow these steps:
- Download CKDecode through this link
- Click on the Functions Tab and select VAG – Bosch – MED17.5.21 – Immo off
- Read Flash with your interface and upload the file
- Click Process button
- Write the file processed by CKDecode
