Scania 1529790 HPI Unit Injector | 24V, DC12/DT12 Applications & 12-Month Warranty

When I help a diesel repair shop identify a Scania injector, I do not recommend selecting the part only from the truck model.

For HPI engines, the injector is part of a specific fuel-injection system, and different injector numbers can look similar while having different application or calibration requirements.

The Scania 1529790 HPI unit injector is a widely referenced HPI injector number associated with 574860, 1846350 and 579262 in current industry parts catalogs. It is used in selected Scania heavy-duty applications, including P/G/R/T-series trucks and HPI engine configurations. Current market listings show 1529790 together with 574860, 1846350 and 579262 as a recognized injector reference group.

Scania's own parts documentation also confirms that HPI unit injectors are a separate injector category, distinct from PDE and XPI systems, with HPI applications including DC12 and DT12 engines.

For our overseas repair-shop customers, my first recommendation is always the same:

Send us the original injector number, engine model and engine serial number before ordering.

This gives us a much better basis for confirming the correct replacement than using the truck model alone.

Product Overview

Important: Public catalogs show a strong relationship between 1529790, 574860, 1846350 and 579262, but I do not recommend treating every number found in online injector listings as a universal one-to-one replacement. Compatibility should be confirmed using the original injector number and engine configuration.

1. What Is the Scania 1529790 HPI Injector?

The 1529790 is an HPI electronic unit injector used in selected Scania heavy-duty diesel applications.

Unlike a conventional common rail injector, a unit injector is closely integrated with the engine's high-pressure fuel generation and injection process.

This distinction is important when you are repairing a Scania engine.

A workshop should not simply search for:

“Scania DC12 injector”

and choose the first visually similar product.

Instead, I recommend confirming:

• Original injector part number

• Engine model

• Engine serial number

• Fuel-system type

• Vehicle series

• Original injector markings

• Existing injector configuration

Scania's official parts information separates PDE, HPI and XPI injector categories, which is one reason we always check the fuel-system type before confirming a replacement.

2. 1529790 Cross-Reference Numbers

For this product page, the most important reference numbers are:

• 1529790

• 574860

• 1846350

• 579262

Current market listings repeatedly group these numbers together for Scania injector applications. Autoline currently shows multiple listings for 574860 / 1529790 / 1846350 / 579262, including applications on Scania P/G/R/T-series trucks.

Another current listing identifies 574860 with OEM references 1529790, 1846350 and 579262, further supporting this reference group.

Important Cross-Reference Warning

I do not recommend publishing every number appearing in third-party catalogs as an automatic interchangeable OE number.

For example, some B2B listings place 4088725, 4902818 and 574398 under a different injector reference, including 1464994.

Therefore, we keep the 1529790 page technically conservative:

1529790 / 574860 / 1846350 / 579262

are the main reference group we use for this product, while other numbers must be verified individually.

3. Scania HPI System — Why the Correct Injector Matters

Scania's official service documentation separates its injector products into three major categories:

• PDE Unit Injector

• HPI Unit Injector

• XPI Unit Injector

For HPI engines, Scania lists dedicated HPI unit injectors for applications including DC12 and DT12.

This is important because an HPI injector should not be replaced simply because another injector has a similar shape or fits into the same cylinder head.

From a repair engineer's perspective, the important questions are:

Does the injector belong to the correct fuel-system family?

Does the injector number match the engine configuration?

Does the replacement injector have the correct internal calibration and performance characteristics?

Those questions are much more important than appearance alone.

4. Why Repair Shops Replace 1529790 Injectors

When an HPI injector begins to wear or its fuel-delivery characteristics move outside the required range, the engine may develop several performance problems.

Common symptoms that can lead a technician to inspect the injectors include:

Difficult Starting

The engine may take longer to start or require repeated cranking.

Rough or Unstable Idle

Uneven fuel delivery between cylinders can produce noticeable vibration or unstable engine operation.

Reduced Power

Poor fuel delivery can affect combustion efficiency and engine response.

Excessive Smoke

Incorrect injection quantity or poor atomization can contribute to incomplete combustion.

Increased Fuel Consumption

Fuel-delivery problems can reduce operating efficiency.

Cylinder Imbalance

One cylinder may contribute less power than the others, producing uneven engine operation.

Injector-Related Faults

Electronic or fuel-system diagnostics may indicate an injector or cylinder-specific problem.

However, I always tell our customers:

A symptom is not the same thing as a diagnosis.

Before replacing the injector, the workshop should also check the fuel supply, fuel filters, engine condition, wiring and other related systems.

5. Our Injector Testing Process

For B2B repair-shop customers, bench testing is one of the most important parts of our quality-control process.

An injector can look completely normal from the outside while having an internal leakage or fuel-delivery problem.

Our technicians therefore inspect applicable injector characteristics before shipment.

Depending on the product version and test-bench specification, our inspection may include:

• Electrical response

• Fuel delivery

• Injection performance

• Leakage condition

• Mechanical condition

• Spray/atomization behavior where applicable

• Overall injector performance

For remanufactured injectors, we additionally inspect the condition of critical internal components before final assembly and testing.

Our objective is straightforward:

We want the injector to arrive at your workshop as a tested component, not as another unknown variable in the diagnosis.

6. 24V Heavy-Truck Application

The 1529790 injector is commonly listed for heavy-duty Scania vehicle applications using a 24V electrical system.

Typical vehicle environments include:

• Long-haul tractor units

• Heavy-duty distribution trucks

• Construction trucks

• Dump trucks

• Fleet vehicles

• Engineering vehicles

• Regional transport trucks

Current listings show 1529790 applications across Scania P/G/R/T-series trucks.

However, the vehicle series alone does not guarantee injector compatibility.

For example, two trucks from the same series may use different engine or injector configurations.

That is why we verify the original injector number before shipment.

7. Injector Installation Recommendations

When replacing an HPI unit injector, I recommend treating installation as part of the repair process rather than simply changing one component.

Before installation:

1. Clean the injector installation area.

2. Inspect the injector seat and sealing surface.

3. Check fuel-system cleanliness.

4. Inspect the fuel filter.

5. Confirm the injector identification.

6. Prepare the correct sealing components.

7. Follow the applicable Scania installation procedure.

After installation:

1. Perform the required mechanical adjustment.

2. Complete any applicable electronic adaptation or diagnostic procedure.

3. Start the engine.

4. Check for abnormal noise or vibration.

5. Inspect for fuel leakage.

6. Check diagnostic information.

7. Perform an operating/load test where appropriate.

The exact adjustment and torque specifications should always come from the applicable Scania workshop documentation for the engine being repaired.

8. Does 1529790 Require ECU Coding?

This is one of the statements I would change from your original product page.

I would not write:

“ECU coding is always required.”

That is too absolute for an HPI unit injector page.

Instead, our recommended wording is:

Follow the applicable Scania calibration, adjustment and diagnostic procedure for the specific engine configuration after injector replacement.

Depending on the engine and control system, the replacement process may involve mechanical injector adjustment, diagnostic adaptation or other specified procedures.

For repair shops, this is more technically accurate than telling every customer that a generic “injector code” must always be entered into the ECU.

9. Fuel Contamination Can Cause Repeat Injector Failures

If a replacement injector fails again shortly after installation, I recommend checking the fuel system before blaming the replacement injector.

Important inspection points include:

• Fuel contamination

• Water in fuel

• Dirty fuel filters

• Incorrect filter installation

• Fuel-system wear

• Metal contamination

• Poor fuel quality

• Damaged sealing components

• Incorrect installation

A new injector installed into a contaminated fuel system can be damaged again.

This is especially important for fleet maintenance workshops because repeated injector failures create much higher costs than the injector itself.

The real cost includes:

Parts + Labor + Truck Downtime + Diagnosis + Customer Complaints + Repeat Repair

10. New and Remanufactured 1529790 Injectors

We supply both new and remanufactured injector options depending on the part number and current stock.

New Injector

Suitable for workshops and distributors that prefer a new replacement component.

New Aftermarket Injector

A competitive option for customers who need a cost-effective replacement solution.

Remanufactured Injector

Suitable for customers looking for a lower-cost alternative with controlled inspection and bench testing.

For remanufactured units, an old-core return or core deposit may apply.

The exact core policy should be confirmed before ordering because it can vary according to the product and order arrangement.

11. Our Remanufacturing Process

For remanufactured HPI injectors, our process is more than external cleaning.

Our general workflow is:

Core Inspection

↓

Disassembly

↓

Cleaning

↓

Internal Component Inspection

↓

Replacement of Required Components

↓

Assembly

↓

Bench Testing

↓

Final Inspection

↓

Export Packing

The finished injector must meet the applicable testing requirements before we release it for shipment.

For B2B customers buying multiple injectors, this controlled process helps provide more consistent workshop stock.

12. 1529790 Application Verification

The safest way for us to confirm the injector is to compare the original part information with the engine configuration.

Please send us:

• Original injector number

• Engine model

• Engine serial number

• Truck model

• Vehicle year if available

• Original injector photo

• Quantity required

For a regular customer, we can also build a reference list based on your most frequently repaired Scania engines.

This makes repeat orders much faster.

13. Related Scania HPI Injector Numbers

Our current product range includes several HPI injector numbers that appear in the same broader Scania injector market.

Scania 1464994 HPI Injector | 24V, 1.35 kg Class & Reference-Number Matching

Part Number: 1464994
Publicly Listed References: 4088725, 4902818, 574398, 1764364, 1846350
System: HPI Unit Injector
Electrical System: 24V class
Approx. Weight: 1.35 kg class
Quality: New / Remanufactured
Warranty: 12 months

Important: this product has a different reference structure from the main 1529790 product. Current B2B listings associate 1464994 with 4088725, 4902818 and 574398, so we recommend keeping these two product pages separate rather than presenting all numbers as universal equivalents.

Scania 1481827 HPI Injector | 24V, DC12/DC13 Support & Bench Tested

Part Number: 1481827
Reference Numbers: 1521977, 1846347
Application: Selected Scania DC12/DC13 HPI applications
System: HPI Unit Injector
Electrical System: 24V class
Approx. Weight: 1.35 kg class
Quality: New / Remanufactured
Warranty: 12 months

This reference belongs to a different HPI injector family and should not automatically be mixed with the 1529790 reference group.

Scania 1499714 HPI Injector | 24V, DC13 Applications & Reman Support

Part Number: 1499714
Reference Numbers: 1521978, 1846349
Application: Selected Scania DC13 HPI applications
System: HPI Unit Injector
Electrical System: 24V class
Approx. Weight: 1.35 kg class
Quality: New / Remanufactured
Warranty: 12 months

Scania 1521977 HPI Injector | 24V, DC12/DC13 & Heavy-Truck Applications

Part Number: 1521977
Reference Numbers: 1481827, 1846347, 1846348
Application: Selected Scania DC12/DC13 HPI applications
System: HPI Unit Injector
Electrical System: 24V class
Approx. Weight: 1.35 kg class
Quality: New / Remanufactured
Warranty: 12 months

Scania 1521978 HPI Injector | 24V, DC13 & Construction-Truck Applications

Part Number: 1521978
Reference Numbers: 1499714, 1846348, 1846349
Application: Selected Scania DC13 HPI applications
System: HPI Unit Injector
Electrical System: 24V class
Approx. Weight: 1.35 kg class
Quality: New / Remanufactured
Warranty: 12 months

Scania 1529790 HPI Injector | 24V, 1.35 kg Class & DC12/DT12 Applications

Part Number: 1529790
Main References: 574860, 1846350, 579262
System: HPI Unit Injector
Electrical System: 24V class
Approx. Weight: 1.35 kg class
Quality: New / Remanufactured
Warranty: 12 months

This is the main product of this page.

Current industry listings consistently show the combination 574860 / 1529790 / 1846350 / 579262 for Scania injector applications.

Scania 1731091 HPI Injector | 24V, Long-Haul Applications & 12-Month Warranty

Part Number: 1731091
Reference Numbers: 1846351, 1764365
Application: Selected Scania HPI-related applications
System: Verify HPI/XPI configuration before ordering
Electrical System: 24V class
Approx. Weight: 1.35 kg class
Quality: New / Remanufactured
Warranty: 12 months

Because public catalogs can classify related injector numbers differently, we recommend confirming the original injector before shipment.

Scania 1764364 HPI Injector | 24V, DC12/DC13 Reference & Bench Tested

Part Number: 1764364
Reference Numbers: 1846350, 579262, 1529790
Application: Selected HPI applications
System: HPI Unit Injector
Electrical System: 24V class
Approx. Weight: 1.35 kg class
Quality: New / Remanufactured
Warranty: 12 months

This number is commonly associated with the 1846350/579262/1529790 reference group in public injector catalogs.

Scania 1764365 Injector | 24V, HPI/XPI Verification & Heavy-Truck Support

Part Number: 1764365
Reference Numbers: 1846351, 1731091
Application: Selected Scania applications
System: Verify HPI/XPI configuration
Electrical System: 24V class
Approx. Weight: 1.35 kg class
Quality: New / Remanufactured
Warranty: 12 months

We recommend confirming the fuel-system type before ordering because HPI and XPI should not be treated as the same injector system.

Scania 1846347 HPI Injector | 24V, DC12/DC13 & 12-Month Warranty

Part Number: 1846347
Reference Numbers: 1846348, 1846349, 1481827, 1521977
Application: Selected Scania DC12/DC13 HPI applications
System: HPI Unit Injector
Electrical System: 24V class
Approx. Weight: 1.35 kg class
Quality: New / Remanufactured
Warranty: 12 months

This is a separate reference family from the 1529790 / 1846350 / 574860 / 579262 group.

Scania 1846348 HPI Injector | 24V, DC12/DC13 & Bench Tested

Part Number: 1846348
Reference Numbers: 1846347, 1846349, 1521977, 1521978
Application: Selected Scania DC12/DC13 HPI applications
System: HPI Unit Injector
Electrical System: 24V class
Approx. Weight: 1.35 kg class
Quality: New / Remanufactured
Warranty: 12 months

Scania 1846349 HPI Injector | 24V, DC13 Applications & Reman Option

Part Number: 1846349
Reference Numbers: 1846347, 1846348, 1499714, 1521978
Application: Selected Scania DC13 HPI applications
System: HPI Unit Injector
Electrical System: 24V class
Approx. Weight: 1.35 kg class
Quality: New / Remanufactured
Warranty: 12 months

Scania 1846350 HPI Injector | 24V, 1.35 kg Class & 1529790 Reference

Part Number: 1846350
Reference Numbers: 1529790, 574860, 579262, 1764364
Application: Selected Scania HPI applications
System: HPI Unit Injector
Electrical System: 24V class
Approx. Weight: 1.35 kg class
Quality: New / Remanufactured
Warranty: 12 months

The 1846350 reference has a particularly clear relationship with 1529790, 574860 and 579262 in current market listings.

Scania 1846351 Injector | 24V, HPI/XPI Verification & 12-Month Warranty

Part Number: 1846351
Reference Numbers: 1731091, 1764365
Application: Selected Scania applications
System: Verify HPI/XPI configuration
Electrical System: 24V class
Approx. Weight: 1.35 kg class
Quality: New / Remanufactured
Warranty: 12 months

14. HPI vs XPI: Why We Check Before Shipping

Scania's official documentation makes an important distinction between:

Unit Injector — HPI Engines

and

Unit Injector — XPI Engines.

For example, Scania's parts documentation lists HPI applications such as DC12 and DT12, while XPI injectors are listed separately for D12/DC9 and D9/D13 applications.

Therefore, I never recommend telling a customer:

“All Scania DC12/DC13 injectors are interchangeable.”

That is not a technically safe statement.

Instead, we identify:

Engine → Fuel System → Original Injector Number → Replacement Number

before confirming the product.

15. B2B Supply for Overseas Repair Shops

Our main customers are not individual car owners.

We mainly work with:

• Scania repair workshops

• Heavy-truck repair garages

• Fleet maintenance companies

• Truck engine rebuilders

• Construction equipment service centers

• Mining equipment workshops

• Diesel parts wholesalers

• Regional distributors

• Truck parts importers

For these customers, we provide:

Mixed Part Numbers

Different injector numbers can be combined according to the applicable MOQ.

New and Remanufactured Options

We provide different quality options according to workshop requirements and budget.

Neutral Export Packaging

Suitable for distributors who do not want supplier branding on the external carton.

Customer Logo Packaging

Available for qualified B2B orders.

Core Exchange Support

Applicable to selected remanufactured injector products.

Technical Matching

Our engineers can compare the original injector number and engine information before shipment.

Global Delivery

We support international shipment according to destination, quantity and logistics requirements.

16. Our Quality-Control Workflow

Our standard workflow is:

Part Number Confirmation

↓

Application Verification

↓

Component Inspection

↓

Assembly / Remanufacturing

↓

Bench Testing

↓

Final Quality Inspection

↓

Packing

↓

International Shipment

This process is designed to reduce wrong-part shipments and avoid sending unverified injectors to overseas workshops.

17. 12-Month Warranty

We provide a 12-month warranty for applicable injector products according to our warranty terms.

If a customer reports a problem, our technical team normally asks for:

• Part number

• Order number

• Engine model

• Engine serial number

• Installation information

• Diagnostic fault codes

• Test results

• Photos or videos where necessary

This allows us to distinguish between:

injector failure

and

fuel-system / engine / installation problems.

This diagnostic approach is important because replacing another injector is not always the correct solution.

18. Frequently Asked Questions

Q1. Is Scania 1529790 the same as 1846350?

They are commonly listed together in the same injector reference group, along with 574860 and 579262.

However, we still recommend confirming the original injector number and engine configuration before ordering.

Q2. Is 1529790 an HPI injector?

Yes. The product should be described as a Scania HPI Unit Injector for the applicable HPI engine configuration.

Scania's official documentation separately identifies HPI Unit Injectors from PDE and XPI injectors.

Q3. Does 1529790 fit every Scania DC12 or DT12 engine?

No.

It is used in selected HPI applications. We recommend confirming the original injector number and engine configuration.

Q4. Is 1529790 the same as 1464994?

Do not automatically treat them as identical.

Current B2B listings associate 1464994 with a different reference group including 4088725, 4902818 and 574398, while 1529790 is more consistently associated with 574860, 1846350 and 579262.

Q5. Can I use the truck model to select the injector?

I do not recommend it.

The safest information is:

Original injector number + engine model + engine serial number.

Q6. Do you supply new and remanufactured injectors?

Yes. We supply new and remanufactured options according to part number and current stock.

Q7. Is there a core charge for remanufactured injectors?

A core deposit or core-return requirement may apply to selected remanufactured products.

Please confirm this before ordering.

Q8. Do you provide injector testing?

Yes. Applicable injectors are inspected and bench-tested before shipment according to the product specification.

Q9. What is the warranty?

Our standard warranty for applicable products is 12 months.

Q10. What is your delivery time?

For stocked products, our normal preparation target is 3–7 working days, depending on quantity and order confirmation.

Q11. Can I mix different Scania injector numbers?

Yes. We support mixed part-number orders for qualified B2B customers according to the applicable MOQ.

Q12. Can you identify the correct injector for my workshop?

Yes.

Send us the original injector number, engine model, ESN and a clear injector photo if available.

We will check the available reference and application information before confirming the order.

19. Why We Focus on Part-Number Accuracy

As a diesel fuel-system supplier, I have seen many injector problems that were actually caused by incorrect part selection.

The wrong injector can result in:

• unnecessary installation labor;

• repeated diagnosis;

• vehicle downtime;

• incorrect fault analysis;

• customer complaints;

• expensive return shipping.

For this reason, our technical process starts before the product is shipped.

We first confirm:

What injector do you have?

What engine is it installed on?

What fuel system does the engine use?

Which replacement number is actually appropriate?

Only after those questions are answered do we recommend the product.

20. How to Order Scania 1529790

If you need a 1529790 HPI unit injector, please send us:

Original injector number: 1529790 / 574860 / 1846350 / 579262 or the number shown on your existing injector

Engine: DC12 / DT12 or other engine identification

ESN: Engine Serial Number, if available

Vehicle: P / G / R / T series or specific application

Quantity: Number of injectors required

Condition: New or remanufactured

Photo: Clear photos of the original injector are helpful

We will use this information to verify the correct product before shipment.