OEX Alternator 12V 150A Denso Style DXA4021

The OEX Alternator 12V 150A Denso Style, part number DXA4021, is a new alternator for 12-volt systems with a 150 amp power rating. It is listed as a direct mount alternator and suits Denso unit make applications, so the key match points are the mounting arrangement, pulley setup, and electrical connection details.

This unit has an internal regulator, a 6 groove pulley, and a pulley outside diameter of 54 mm. Other measured details include a 47 mm mount centres A dimension, 50 mm mount leg thickness, and an 11 mm adjusting hole diameter. Those dimensions are the main checkpoints when comparing against the original unit already fitted to the vehicle.

OEX positions this alternator range as an aftermarket option with a focus on quality and reliability, and the factories are ISO9001 certified for engineering, testing, and quality control procedures. It is backed by a 3 year passenger and 1 year commercial warranty, which gives you a clear warranty basis for the application it is fitted to.

Key Features

• 12V alternator with 150A output
• New unit, not remanufactured
• Internal regulator configuration
• 6 groove pulley
• Direct mount design
• Suits Denso unit make applications

Specifications

• Brand: OEX
• Part number: DXA4021
• Product type: Alternator
• Voltage: 12V
• Power rating: 150A
• Unit of measure: Each
• Regulator type: Internal
• Pulley outside diameter: 54 mm

Fitment guidance

• Fitment is not fully verified here, so compare the part number DXA4021 and the physical dimensions against the unit being replaced.
• Confirmed fitment data provided includes Land Rover Discovery applications for model years 2004 to 2009.
• Confirmed fitment data provided also includes Land Rover Range Rover applications for model years 2006 to 2009.
• Use the Denso unit make, direct mount style, 6 groove pulley, 47 mm mount centres A, 50 mm mount leg thickness, and 11 mm adjusting hole diameter as the main comparison points.
• If the existing alternator uses a different regulator type, pulley style, or mounting layout, this unit may not be suitable.

Application and Buying Notes

When replacing an alternator, the safest approach is to match the part number DXA4021 first, then confirm the mounting and drive details. This unit is a 12V, 150A alternator with an internal regulator, so the vehicle’s charging system needs to suit that arrangement before purchase or installation.

The pulley and mounting dimensions matter just as much as the electrical rating. Here the pulley is a 6 groove type with a 54 mm outside diameter, and the mount centres A measurement is 47 mm. The adjusting hole diameter is 11 mm and the mount leg thickness is 50 mm, which should be checked against the old unit and the vehicle bracketry.

A 150A alternator is a substantial charging unit, but the output rating alone does not confirm fitment. Make sure the unit make is Denso, the mount is direct, and the pin code is IR187 if that matches the existing harness and bracket setup. Small differences in plug style or mount geometry are enough to cause installation problems.

Warranty coverage is listed as 3 years for passenger use and 1 year for commercial use. That is useful context, but it does not replace a correct application check. If you are unsure, compare the removed alternator side by side with this part and confirm the dimensions before ordering.

Before supply, the safest approach is to confirm the original unit details against the listed part number, voltage, output rating, mounting arrangement, and pulley configuration. That checking process is standard practice in the parts trade because visually similar units can still differ in service-critical ways.

For workshop, fleet, and equipment applications, accurate identification of part number DXA4021 helps avoid unnecessary freight, additional labour, and vehicle or machine downtime. Where the application is not straightforward, the original unit, OEM reference, or workshop records should be used as the primary confirmation point.

Relevant published details for this unit include Type ALTERNATOR, Unit of Measure EACH, Warranty 3yr Passenger 1yr Commercial, Mount Centres A 47mm, Pin Code IR187, Pulley Outside Diameter 54mm, Regulator Type Internal, Voltage 12, New / Reman. New.

Additional published details for cross-checking include Product Group 2 ALTERNATORS, Part No. DXA4021, Brand OEX, Description OEX Alternator 12V 150A Denso Style, Adjusting Hole Diameter 11, Mount Leg Thickness 50mm, Power Rating (Amp) 150, Pulley Section 6 Groove, Suits Unit Make Denso, Alternator Mount Direct.

OEX Alternator 12V 150A Denso Style. Part number DXA4021 should be checked first. Listed voltage is 12. Listed output rating is 150. These details form the core reference points used by parts interpreters when confirming the correct replacement.

Mount style is Direct. Regulator type is Internal. Pulley configuration is 6 Groove. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number DXA4021, the normal identification sequence is part number, electrical rating, mounting arrangement, connector or terminal style, and pulley or drive details. Using those checkpoints helps confirm that the listed unit matches the service requirement rather than only looking similar.

For a alternator in workshop, fleet, trade, agricultural, or construction service, the listed voltage 12 and output 150 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Compatibility note: Please confirm fitment by checking part number DXA4021, the Denso-style direct mount layout, and the measured dimensions against the alternator already fitted to the vehicle.

FAQ

What is the part number for this alternator?

The part number is DXA4021.

Is this alternator new or remanufactured?

It is listed as new.

What is the voltage and output rating?

It is a 12V alternator with a 150A power rating.

Does it have an internal or external regulator?

It has an internal regulator.

What pulley and mounting details are listed?

The pulley is a 6 groove type with a 54 mm outside diameter. Mount centres A is 47 mm, mount leg thickness is 50 mm, and the adjusting hole diameter is 11 mm.

What warranty is provided?

The warranty is 3 years for passenger use and 1 year for commercial use.