VW Audi Seat Engine ECU IMMO OFF 0261S04399 03C906022AL – Plug & Play
0261S04399 / 03C906022AL is an original Bosch ECU ENGINE CONTROLLER used in selected VW, Audi and Seat vehicles equipped with gasoline TSI / TFSI engines. This module has been professionally prepared in IMMO OFF Plug&Play version, allowing installation without immobilizer programming after fitting.
The ECU is electronically tested, verified before shipment and ready for installation. Every unit is checked on professional diagnostic equipment to ensure stable communication and proper operation. For compatibility, always compare both Bosch and OEM part numbers before purchase.
Compatible vehicles – 0261S04399 / 03C906022AL
- VW Golf VI 1.2 TSI
- VW Golf VI 1.4 TSI
- VW Touran 1.4 TSI
- VW Caddy TSI
- Audi A3 1.4 TFSI
- Seat Leon 1.2 TSI
- Seat Leon 1.4 TSI
- Seat Altea
- Seat Toledo
Supported engine codes
Part numbers
- 0261S04399
- 03C906022AL
- Bosch MED17 ECU
IMMO OFF Plug & Play solution
The immobilizer function has been professionally disabled inside the ECU software. In most compatible vehicles, installation is performed as Plug&Play without coding, online adaptation or immobilizer synchronization.
This solution is commonly used when the original ECU has internal electronic damage, immobilizer failure, no communication problem or water damage.
Typical symptoms of damaged ECU 03C906022AL
- engine does not start,
- immobilizer active warning,
- no ECU communication via diagnostics,
- engine stalls during driving,
- random injection or ignition faults,
- intermittent loss of power.
Why choose our ECU ENGINE CONTROLLER?
- original Bosch ECU,
- professionally tested electronics,
- stable diagnostic communication,
- Plug&Play IMMO OFF preparation,
- warranty included,
- fast shipping across Europe.
FAQ – ECU 0261S04399 03C906022AL
Does 0261S04399 fit VW Golf VI 1.4 TSI?
Yes, 0261S04399 is commonly installed in selected VW Golf VI 1.4 TSI models. Compatibility must always be confirmed by matching the exact Bosch and OEM numbers.
Is 03C906022AL Plug & Play?
Yes, this ECU is supplied in IMMO OFF Plug&Play configuration and usually does not require immobilizer programming after installation.
Can ECU 03C906022AL work in Audi A3 1.4 TFSI?
Yes, this ECU ENGINE CONTROLLER was used in selected Audi A3 TFSI vehicles with compatible engine configuration and matching part numbers.
Seat Leon 1.2 TSI – will Bosch 0261S04399 work?
The most important requirement is exact compatibility of both part numbers: 0261S04399 and 03C906022AL.
What are the symptoms of a faulty 03C906022AL ECU?
Typical symptoms include no engine start, immobilizer errors, loss of ECU communication, random stalling and ignition or injection related faults.
Do I need coding after installation?
In most cases no coding is required because the immobilizer has already been disabled in the ECU software.
Is this an original Bosch ECU?
Yes, this is an original Bosch engine ECU, not an aftermarket replacement.
What should I compare before ordering 0261S04399?
Please compare the complete Bosch number 0261S04399 and OEM number 03C906022AL from your original ECU.
Can a damaged ECU cause no communication?
Yes, internal electronic failure inside the Bosch MED17 ECU may cause complete loss of diagnostic communication.
Does IMMO OFF remove immobilizer problems permanently?
Yes, the immobilizer function is disabled directly in the ECU software, eliminating synchronization issues between ECU and immobilizer system.
