Description
The A6681530279 is an original diesel engine management module fitted to the Mercedes-Benz W168 A-Class CDI — the common-rail diesel variant of the first-generation A-Class, built between 1997 and 2004. Carrying the 668-series designation that identifies the 1.7-litre CDI four-cylinder engine, this ECU governs fuel injection quantity, rail pressure, glow plug activation and exhaust gas recirculation on the diesel drivetrain.
The module receives data from the high-pressure fuel rail sensor, crankshaft sensor, EGR valve position and boost pressure transducer to calculate injection timing and duration on each combustion cycle. The CDI system’s split-injection strategy — pilot injection followed by main injection — is managed entirely by this unit, giving the engine its characteristic smooth power delivery with minimal diesel clatter at all loads.
On the W168 CDI, a deteriorating ECU may present as difficult cold starting, persistent white or black smoke after warm-up, uneven idle with fluctuating revs, sudden loss of turbo boost, or fault codes relating to injection quantity deviation that reappear after the injectors and sensors have been verified as serviceable.
This is a genuine used OEM unit sourced from a W168 A-Class CDI and tested for correct operation before listing. As with any used diesel control module, the unit may need to be programmed or adapted to the target vehicle by a suitably equipped specialist. Please confirm the part number matches your existing ECU before ordering.
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/
