Vauxhall Signum D19AA Injectors

Vauxhall Signum D19AA Overview

The Vauxhall Signum with the D19AA Fiat / Opel 1.9 JTD / CDTi engine was produced between 2004 and 2008. This vehicle uses Bosch common rail diesel injectors (primary part number 0445110276) operating at fuel pressures up to 2000 bar. The D19AA engine in the Vauxhall Signum produces and of torque. When replacing injectors on the Vauxhall Signum D19AA, 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 Vauxhall Signum

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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.

Other Engine Codes for Vauxhall Signum

Other D19AA Vehicles

Related Pages

Bosch Fiat / Opel 1.9 JTD / CDTi — browse compatible engines, vehicles, and injectors