Description
Part number 03G906021NK is a genuine used, tested Engine ECU Control Module from the Volkswagen 03G-series TDI diesel engine management family. This unit was manufactured to OEM specification for fitment to VAG Group diesel models and was recovered from a written-off donor vehicle prior to testing and listing.
The 03G ECU platform manages all aspects of common rail or unit injector diesel operation, including start-of-injection timing, fuel quantity correction per cylinder, EGR valve duty cycle, variable geometry turbocharger (VGT) control, and glow plug activation during cold starts. Its adaptive correction maps are regularly updated during normal driving to compensate for injector wear.
ECU failure on 03G-series diesel engines frequently manifests as sudden loss of power accompanied by limp mode, repeated fault codes for injection regulation, excessive fuel consumption without apparent cause, hard starting when cold, or a diesel knock that cannot be attributed to injector or pump mechanical wear alone.
This ECU was recovered from a suitable written-off VAG diesel vehicle and tested to verify it meets the 03G906021NK OEM standard. After fitting, coding and adaptation using VCDS or a compatible tool is mandatory for correct operation. Professional installation is required. A 14-day return period applies to this listing.
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/
