Description
OEM number 8D0907401N is a genuine Audi A4 B5 Engine ECU Control Module, shared across the wider VAG B5 platform that includes the Passat and Superb. Recovered from a written-off donor and fully bench-tested, this unit is ready for professional installation.
The A4 B5 petrol ECU operates on Bosch Motronic ME7, overseeing fuel injection duration and timing, knock sensor response, throttle control, idle stabilisation, and emissions management. It communicates with the immobiliser transponder and instrument cluster via the K-line diagnostic bus on earlier variants.
A degrading B5 ECU can cause hard cold starts, erratic idle speed, intermittent misfires, fuelling faults under full load, unexplained stalling, or stored codes for internal ECU faults and driver stage failures reported during VAG-COM scanning.
This is a used and tested component. Always match OEM number 8D0907401N to your specific vehicle and engine code. Professional fitting is advised. Immobiliser adaptation and channel coding via VCDS are likely to be needed. 14-day returns accepted.
Returns accepted only for genuine faults — faulty on arrival, not as described, or wrong part supplied — requested within 14 days, with all 3 anti-tamper stickers intact. No returns for change of mind, incorrect installation, coding/programming, or buyer compatibility errors; checking compatibility (OEM number, firmware, vehicle) is the buyer’s responsibility. Full policy: https://giantparts.eu/refund-and-returns/
