Z19DTJ Diesel Injectors
Compatible with Alfa Romeo 147, Alfa Romeo 156, Alfa Romeo 159, and 10 more
- OEM Tested & Calibrated
- 12-Month Warranty
- Free UK Delivery
Select the correct injector for your Z19DTJ engine below
Fits Alfa Romeo 147, Alfa Romeo 156, Alfa Romeo 159, Alfa Romeo GT and more
Top injectors for Z19DTJ
Compatible Injectors for Z19DTJ
- OEM Tested
- 12-Month Warranty
- Free UK Delivery
Common problems solved by these injectors
About the Z19DTJ engine
The Z19DTJ is a fiat / opel 1.9 jtd / cdti 150hp common rail diesel engine. This engine uses Bosch diesel injectors.
How Diesel Injectors Are Remanufactured
Watch our 3D walkthrough of the diesel injector remanufacturing process and see how injectors are professionally restored for reliable service.
Vehicles Using Z19DTJ Engine
| Vehicle | Engine | Years |
|---|---|---|
| Alfa Romeo 147 injector | 1.9 JTDM | |
| Alfa Romeo 156 injector | 1.9 JTD | |
| Alfa Romeo 159 injector | 1.9 JTDM | |
| Alfa Romeo GT injector | 1.9 JTD | |
| Fiat Bravo injector | 1.9 MultiJet | |
| Fiat Croma injector | 1.9 JTD | |
| Fiat Stilo injector | 1.9 JTD | |
| Saab 9-3 injector | 1.9 TiD |
Common Z19DTJ Injector Problems
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.
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.
Poor fuel economy
A worn or leaking injector delivers incorrect fuel quantities, reducing efficiency by 10–20% in severe cases.
Engine misfire under load
Intermittent misfires during acceleration suggest one or more injectors are failing to deliver the correct fuel pressure.
Difficult cold starting
Degraded injector nozzles struggle to atomise fuel at lower cranking pressures, causing extended crank times in cold weather.
Loss of power
Gradual power loss across the rev range, particularly above 2500 RPM, can indicate injector flow rate degradation.
Increased diesel knock
Louder than normal combustion noise, especially at idle, can indicate incorrect injection timing due to worn injector internals.
Z19DTJ Technical Specifications
Displacement
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Power
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Torque
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Fuel System
Common Rail Direct Injection
The Z19DTJ is a fiat / opel 1.9 jtd / cdti 150hp common rail diesel engine. This engine uses Bosch diesel injectors.
Engine Intelligence
Fiat / Alfa / Vauxhall 1.9 JTD & CDTI 16v 150 (Z19DTH — Vectra, Astra, 159, Bravo)
Documented failure modes
- Injector wiring / connector faults logging single-cylinder circuit codes (a documented weak point on this engine — especially injector 3)
- Injector back-leak beyond specification
- Nozzle wear causing over-fuelling and smoke
Diagnostic guidance
- On a single-cylinder circuit code, inspect the injector plug and loom first — wiring faults on this engine routinely mimic a failed injector
- If several injector codes appear together, suspect a supply/loom or ECU driver fault rather than multiple simultaneous injector failures
- Clear codes and confirm which returns first before replacing hardware
- Run a comparative leak-off test to separate electrical from hydraulic faults
Fitment note: The 150 hp 16v (Z19DTH / 937A5000 group) uses different injectors from the 120 hp 8v generation — match the reference etched on the injector body before ordering.
Related Z19DTJ Engine Guides
Related Pages
Bosch Fiat / Opel 1.9 JTD / CDTi 150hp — browse compatible engines, vehicles, and injectors