Description
OEM number 8D0907557BX designates a genuine Audi A4 B5 Engine ECU Control Module. The X suffix on this VAG part number typically indicates an exchange unit refurbished to OEM standard; this example has been sourced from the trade and bench-tested before being offered here.
Operating on the B5 platform, this ECM oversees the full fuelling and ignition cycle on its associated petrol or diesel engine. On TDI diesel applications it works within the Bosch EDC15 framework to regulate injection timing and quantity, turbo boost, and glow-plug activation. On petrol engines it manages Motronic ME7 ignition and injection sequences.
Failure modes on the A4 B5 ECU include cold-start difficulty, rough running that worsens with engine load, increased fuel consumption, emission test failures, intermittent power cut-outs, or fault codes stored for ECU RAM, EEPROM, or internal driver stage errors.
Sold as a used and tested unit. Always confirm that OEM reference 8D0907557BX matches your specific A4 B5 variant and engine code before ordering. Specialist technician installation is strongly advised. Immobiliser adaptation and output stage settings via VCDS will likely be required. 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/
