Description
Part number 8D0907557B is a genuine Audi A4 B5 Engine ECU Control Module, shared across the broader VAG B5 platform including Passat B5 and Superb variants. Removed from a written-off donor and fully bench-tested, this unit is ready for fitting by a qualified technician.
The 8D0907557B unit manages combustion on its associated B5 engine through sequential injection, ignition event control, boost management on turbocharged variants, and exhaust emissions strategy. It communicates with the immobiliser system and instrument cluster via the diagnostic bus, and with the ABS and transmission modules through the vehicle network.
A compromised A4 B5 ECU often reveals itself through an illuminated engine management light, fault codes for driver stage or sensor circuit failures, unstable idle, hard starts after the vehicle sits overnight, or sudden misfires during spirited driving or gear changes under load.
Supplied as a used and tested part. Cross-check OEM number 8D0907557B against your vehicle data before purchase. Fitting by an experienced VAG technician is recommended. Adaptation and immobiliser coding through VCDS or an equivalent diagnostic tool will be required. 14-day returns apply.
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/
