Audi A8 / A8 L (D3) ASE Injectors

Audi A8 / A8 L (D3) ASE Overview

The Audi A8 / A8 L (D3) with the ASE 4.0L TDI V8 engine was produced between 2003 and 2005. This vehicle uses Bosch common rail diesel injectors (primary part number 0445110158) operating at fuel pressures up to 2000 bar. The ASE engine in the Audi A8 / A8 L (D3) produces and of torque. When replacing injectors on the Audi A8 / A8 L (D3) ASE, always use new copper sealing washers and torque to manufacturer specifications. Each injector should be coded to the ECU after fitting.

Compatible Injectors

Common Injector Problems in Audi A8 / A8 L (D3)

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  Rough idle and engine vibration — Worn injector nozzles cause uneven fuel spray, leading to rough idle at low RPM. Most noticeable when the engine is cold.
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  Excessive exhaust smoke — Black or blue-grey smoke on acceleration indicates poor fuel atomisation. This is often caused by carbon buildup on the injector nozzle tip.
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  Poor fuel economy — A worn or leaking injector delivers incorrect fuel quantities, reducing efficiency by 10–20% in severe cases.
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  Engine misfire under load — Intermittent misfires during acceleration suggest one or more injectors are failing to deliver the correct fuel pressure.
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  Difficult cold starting — Degraded injector nozzles struggle to atomise fuel at lower cranking pressures, causing extended crank times in cold weather.

Related Pages

Bosch 4.0L TDI V8 — browse compatible engines, vehicles, and injectors