Bosch Common Rail diesel injectors rely on precise fuel metering to keep combustion stable and engine running smooth. The Bosch 445110299 (0 445 110 299) unit must be matched by reference number and engine code before installation.
Part identification and catalog/cross-references
Bosch diesel injector 445110299 is a Common Rail fuel metering component used to deliver precise injection into the combustion chamber. The same part is also listed as 0 445 110 299, so both reference formats should be treated as the same identification target during selection.
This injector is intended for accurate fuel dosing, which directly affects combustion quality, engine running characteristics, cold start behaviour, consumption and power delivery. When the injector’s spray quantity or spray pattern deviates from specification, drivability and efficiency can deteriorate even if the rest of the high-pressure system is functioning correctly.
For correct fitment, cross-check the reference number on the old unit against 445110299 and confirm the engine code and vehicle data using the compatibility information on the product page. The product data also indicates that vehicle assignment is handled via TecDoc compatibility details and a vehicle widget, so do not rely on model name alone.
Vehicle compatibility with ONE table
The injector reference 445110299 is listed for multiple Alfa Romeo 2.0 JTDM applications across the 159 and Brera ranges, and also for the Giulia/Julietta family shown below. Always verify the engine code and the old-unit markings before ordering, because the same model can appear with different driveline specifications.
| Vehicle | Engine family / code shown | Production range shown |
|---|---|---|
| ALFA ROMEO 159 (939_) 2.0 JTDM | (939AXP1B) | (05/2009-11/2011) |
| ALFA ROMEO 159 (939_) 2.0 JTDM | (939AXQ1B) | (05/2009-11/2011) |
| ALFA ROMEO 159 (939_) 2.0 JTDM | (939AXR1B) | (06/2010-11/2011) |
| ALFA ROMEO 159 Sportwagon (939_) 2.0 JTDM | (939BXP1B) | (07/2009-11/2011) |
| ALFA ROMEO 159 Sportwagon (939_) 2.0 JTDM | (939BXQ1B) | (05/2009-11/2011) |
| ALFA ROMEO 159 Sportwagon (939_) 2.0 JTDM | (939BXR1B) | (06/2010-11/2011) |
| ALFA ROMEO BRERA (939_) 2.0 JTDM | (939DXP1B) | (05/2008-06/2010) |
| ALFA ROMEO BRERA (939_) 2.0 JTDM | (939DXQ1B) | (03/2008-06/2010) |
| ALFA ROMEO GIULIETTA (940_) 2.0 JTDM | (940.FXL1A, 940FXG11) | (04/2010-12/2020) |
Fitment checks and installation cautions
Before installing Bosch injector 445110299, match the reference number on the removed injector to 445110299 (and also recognise the equivalent listing format 0 445 110 299). The product data explicitly advises comparing reference number, OEM numbers, engine code letters and vehicle data with the old unit.
Common Rail injectors are sensitive to correct identification because even small differences in calibration can change injection quantity and spray behaviour. If the wrong injector variant is fitted, the engine can run rough due to altered combustion conditions, and cold start behaviour can worsen because fuel metering is no longer aligned with the engine’s control strategy.
During fitment, keep the injector’s sealing surfaces clean and ensure the injector is seated correctly in the cylinder head. Any contamination or incorrect seating can disturb the fuel delivery and contribute to uneven running, which is exactly the kind of symptom the 445110299 Bosch unit is meant to resolve when the original injector is no longer delivering correct dosing.
After installation, confirm that the vehicle’s engine code and injector identification match the compatibility listing for the relevant model (for example, 159 2.0 JTDM with code 939AXP1B or Brera 2.0 JTDM with code 939DXQ1B). If the engine code differs from the listed codes, treat the compatibility table as a starting point only and re-check by reference number and old-unit markings.
Symptoms and selection notes for 445110299
A worn or incorrectly metering Common Rail injector typically shows up as unstable combustion and degraded engine running, which the product data links directly to injection quantity and spray pattern deviations. The Bosch 445110299 unit is supplied for precise fuel dosing to help restore clean combustion, smooth running, and correct cold start behaviour.
When an injector’s dosing drifts, consumption and power delivery can also change because the engine is not receiving the intended fuel quantity. That’s why selection should be based on the exact reference number 445110299 rather than assuming that all 2.0 JTDM injectors are interchangeable.
Use the old injector as the primary reference: compare its reference number and the engine code letters, then verify the vehicle data against the TecDoc compatibility details shown for this Bosch injector listing. This approach prevents misfitment that can otherwise lead to continued drivability issues even after installing a new injector.
Internal product link (Bosch diesel injector 445110299)
For the Bosch diesel injector reference 445110299 / 0 445 110 299 used on the listed Alfa Romeo 2.0 JTDM applications, use this exact part page: Bosch diesel injector 445110299 (0 445 110 299).
Frequently Asked Questions
How do I verify a Bosch diesel injector reference number 445110299 before fitting?
Compare the reference number on the removed injector to 445110299 and also recognise the equivalent listing format 0 445 110 299. Then confirm the engine code and vehicle data against the compatibility information provided for the injector.
What symptoms point to a faulty Common Rail diesel injector like Bosch 445110299?
The injector can affect combustion quality and engine running smoothness. The product data also links injector metering deviations to cold start behaviour, consumption and power delivery changes.
Can I replace an Alfa Romeo 2.0 JTDM injector using only the model name?
No. The listing depends on engine codes and the exact injector reference number, so you must match the old unit’s reference number and verify the engine code letters before ordering.
Why does injector misfitment cause rough running on Common Rail engines?
Common Rail injectors must deliver the correct fuel quantity and spray behaviour. If the wrong injector variant is fitted, combustion conditions shift and the engine can run unevenly even if the rest of the system is intact.
What does the cross-reference 0 445 110 299 mean compared to 445110299?
It is an alternative reference formatting for the same injector identification. Treat both 445110299 and 0 445 110 299 as the matching reference targets during selection.
