Description
Part number A6681530079 is a factory diesel engine management controller fitted to the Mercedes-Benz W168 A-Class CDI. Like all 668-designation units, it is purpose-built for the W168’s 1.7-litre common-rail diesel engine, responsible for injection control, EGR management, glow plug timing and diagnostic communication across the vehicle’s CAN bus.
The ECU processes signals from the fuel rail pressure sensor, mass airflow meter, diesel temperature sensors and the crankshaft and camshaft position encoders to maintain optimal combustion across all load points. Precise pilot and main injection events are computed on each engine cycle, enabling the CDI unit to balance fuel economy with the low-end torque that made the A-Class diesel a practical urban commuter.
Failure modes specific to this unit on the W168 CDI often include the engine refusing to rev beyond a fixed limit in limp mode, smoke from the exhaust that is not linked to injector wear, DTC codes pointing to rail pressure faults or quantity control valves when those components test correctly, and cold-start hesitation that worsens progressively over time.
This unit is a genuine used original part removed from a W168 A-Class CDI and confirmed operational before despatch. Second-hand diesel ECUs typically require coding, adaptation or immobiliser pairing by a diagnostic specialist. Verify the OEM number on your current unit before placing an order.
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/
