0445110391 — Technical Research
Bosch solenoid common-rail injector for the higher-output 16-valve 1.9 JTDM/CDTi/TTiD (150 hp) engine across Alfa Romeo, Fiat, Vauxhall/Opel and Saab. Bosch exchange 0986435104; OE Fiat/Alfa 55221020 and 55198218. Replacements are coded to the ECU via the injector correction value. Failures are driven by poor fuel filtration, contamination and back-leakage. Key symptoms: Rough idle / vibration; Hard starting; Loss of power / limp mode; Black smoke. Common failure modes: Internal wear / high back-leakage; Water-in-fuel corrosion; Nozzle coking.
Bosch 0445110391 1.9 JTDM/CDTi 16v (150hp) Common Rail Injector (Alfa/Fiat/Vauxhall/Saab)
Bosch solenoid common-rail injector for the higher-output 16-valve 1.9 JTDM/CDTi/TTiD (150 hp) engine across Alfa Romeo, Fiat, Vauxhall/Opel and Saab. Bosch exchange 0986435104; OE Fiat/Alfa 55221020 and 55198218. Replacements are coded to the ECU via the injector correction value. Failures are driven by poor fuel filtration, contamination and back-leakage. Key symptoms: Rough idle / vibration; Hard starting; Loss of power / limp mode; Black smoke. Common failure modes: Internal wear / high back-leakage; Water-in-fuel corrosion; Nozzle coking.
A leaking injector unbalances cylinder fuelling on the 1.9 16v.
Excess back-leakage drops cranking rail pressure.
Out-of-range delivery or rail-pressure deviation cuts power.
Poor atomisation over-fuels the cylinder.
Cylinder-specific injector or fuel-metering codes.
- InstallationCode the injector correction value to the correct cylinder with the relevant diagnostic (Fiat MES / Vauxhall MDI / Saab Tech2) before road test.
- InstallationRenew the copper combustion washer and leak-off seals; torque the clamp to spec.
- MisdiagnosisThis is the 16v 150 hp injector - do not confuse with the 8v 0445110276; confirm the engine code and OE number.
- WarningFix contamination (filter/water/debris) first - the 1.9 16v is sensitive to fuel quality.
- TestingBench-test across delivery and back-leakage points; verify spray pattern before refit.
What is Bosch injector 0445110391?+
A Bosch solenoid common-rail diesel injector for the 16-valve 1.9 JTDM/CDTi/TTiD (150 hp) engine used by Alfa Romeo, Fiat, Vauxhall/Opel and Saab. Bosch exchange 0986435104.
Which vehicles use 0445110391?+
Alfa Romeo 159/Brera/GT/156, Fiat Bravo/Croma/Stilo, Vauxhall/Opel Astra H/Vectra C/Zafira B 1.9 CDTi 16v and Saab 9-3 1.9 TTiD.
Is it solenoid or piezo?+
It is a Bosch solenoid common-rail injector.
How is 0445110391 different from 0445110276?+
0445110391 is the 16-valve 150 hp injector; 0445110276 is the 8-valve unit. Confirm the engine code and OE number before fitting.
Does it need coding?+
Yes - code the injector correction value to the correct cylinder with the relevant diagnostic when fitting.
What are the OE part numbers?+
Fiat/Alfa 55221020 and 55198218 reference Bosch 0445110391; the Bosch exchange number is 0986435104.
What are the symptoms of failure?+
Rough idle, vibration, hard starting, black smoke, power loss/limp mode and an EML.
Why does my 1.9 16v run rough?+
A worn or leaking injector unbalances fuelling; read live correction data and bench-test the weak cylinder.
What causes these injectors to fail?+
Poor fuel filtration, contamination and back-leakage wear - fix the cause first.
Does a remanufactured 0445110391 perform like new?+
A properly remanufactured injector is bench-tested and recalibrated to the Bosch plan, then coded on fitment.