Vauxhall Astra Z19DTJ Injectors

Vauxhall Astra Z19DTJ Overview

The Vauxhall Astra with the Z19DTJ Fiat / Opel 1.9 JTD / CDTi 150hp engine was produced between 2004 and 2010. This vehicle uses Bosch common rail diesel injectors (primary part number 0445110391) operating at fuel pressures up to 2000 bar. The Z19DTJ engine in the Vauxhall Astra produces and of torque. When replacing injectors on the Vauxhall Astra Z19DTJ, 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 Astra

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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 Astra

Other Z19DTJ Vehicles

Related Pages

Bosch Fiat / Opel 1.9 JTD / CDTi 150hp — browse compatible engines, vehicles, and injectors