OEX Alternator 12V 170A Denso Style DXA4131

The OEX Alternator DXA4131 is a new 12V unit rated at 170A, built in a Denso style configuration and suited to Denso applications. It uses an internal regulator, a 6 groove pulley, and a twin leg alternator mount, so the key installation points can be checked before ordering.

This alternator has an inside mounting leg width of 76mm, a mount centre to centre measurement of 127mm, a pivot hole diameter of M10x1.5/10, and an adjusting hole diameter of 11mm. Those measurements matter when matching the unit to the original alternator on the vehicle.

OEX lists this unit under part number DXA4131, with pin code IR169 and a product weight of 7.38kg. It is supplied as each unit and is covered by a 3 year passenger warranty or 1 year commercial warranty, which gives a clear reference point for buyers comparing new replacement alternators.

Key Features

• 12V alternator rated at 170A
• New unit, not remanufactured
• Internal regulator
• 6 groove pulley
• Twin leg alternator mount
• Designed for Denso applications

Specifications

• Voltage: 12V
• Power rating: 170A
• Part number: DXA4131
• Brand: OEX
• Suits unit make: Denso
• Regulator type: Internal
• Pulley section: 6 groove
• Alternator mount: Twin leg

Verified fitment notes

• BMW 1
• BMW 1 2011
• BMW 1 2012
• BMW 1 2013
• BMW 1 2014
• BMW 1 2015

Application and Buying Notes

When replacing an alternator, the safest match is the original part number and the mounting dimensions, not just the electrical rating. For this OEX unit, the important identifiers are DXA4131, Denso style, 12V, 170A, and the twin leg mount with 76mm inside mounting legs and 127mm centre to centre spacing.

Check the pulley detail carefully before ordering. This alternator uses a 6 groove pulley with a 49mm outside diameter, so belt alignment and groove count need to match the vehicle’s existing setup. If the pulley style or groove count differs from the old unit, the alternator may not be a direct swap.

The regulator is internal, which is another useful compatibility check because some charging systems rely on a particular regulator arrangement. The pivot hole diameter of M10x1.5/10 and the 11mm adjusting hole should also be compared against the removed alternator, especially where brackets or bolt hardware have been changed over time.

This is a new alternator, supplied individually, and it weighs 7.38kg. If you are cross-referencing a worn or missing part, use the vehicle application, the measured mount points, and the part number together rather than relying on appearance alone. That approach is especially important on Denso-style charging systems where several versions can look similar from the outside.

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 DXA4131 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, Inside Mounting Legs 76mm, Pivot Hole Diameter M10x1.5/10, Pulley Outside Diameter 49mm, Regulator Type Internal, Voltage 12, Mount Cnt to Cnt 127mm, Weight 7.38kg.

Additional published details for cross-checking include Product Group 1 ROTATING ELECTRICAL, Part No. DXA4131, Brand OEX, Description OEX Alternator 12V 170A Denso Style, Adjusting Hole Diameter 11, Pin Code IR169, Power Rating (Amp) 170, Pulley Section 6 Groove, Suits Unit Make Denso, Alternator Mount Twin Leg.

OEX Alternator 12V 170A Denso Style. Part number DXA4131 should be checked first. Listed voltage is 12. Listed output rating is 170. These details form the core reference points used by parts interpreters when confirming the correct replacement.

Mount style is Twin Leg. 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 DXA4131, 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 170 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Compatibility note: Always confirm fitment using the part number DXA4131, the Denso style designation, and the listed mounting and pulley measurements before purchase. Vehicle application data should be matched against the vehicle already fitted, as alternator changeovers can vary by build and charging system.

FAQ

Is this alternator new or remanufactured?

This OEX alternator is listed as new, not remanufactured. For this listing, part number DXA4131 is the main reference point. Listed voltage is 12. Listed output rating is 170. Published fitment references include BMW 1, BMW 1 2011, BMW 1 2012. These details should still be checked against the original unit before ordering.

What is the electrical rating of this alternator?

It is a 12V alternator with a 170A power rating. For this listing, part number DXA4131 is the main reference point. Listed voltage is 12. Listed output rating is 170. Published fitment references include BMW 1, BMW 1 2011, BMW 1 2012. These details should still be checked against the original unit before ordering.

What type of regulator does it use?

It uses an internal regulator. For this listing, part number DXA4131 is the main reference point. Listed voltage is 12. Listed output rating is 170. Published fitment references include BMW 1, BMW 1 2011, BMW 1 2012. These details should still be checked against the original unit before ordering.

What mounting style does it have?

It uses a twin leg alternator mount with 76mm inside mounting legs and 127mm mount centre to centre. For this listing, part number DXA4131 is the main reference point. Listed voltage is 12. Listed output rating is 170. Published fitment references include BMW 1, BMW 1 2011, BMW 1 2012. These details should still be checked against the original unit before ordering.

What pulley setup does it use?

It has a 6 groove pulley with a 49mm outside diameter. For this listing, part number DXA4131 is the main reference point. Listed voltage is 12. Listed output rating is 170. Published fitment references include BMW 1, BMW 1 2011, BMW 1 2012. These details should still be checked against the original unit before ordering.

How should fitment be confirmed?

Confirm fitment by checking part number DXA4131, Denso style application details, and the listed measurements against the original alternator on the vehicle. For this listing, part number DXA4131 is the main reference point. Listed voltage is 12. Listed output rating is 170. Published fitment references include BMW 1, BMW 1 2011, BMW 1 2012. These details should still be checked against the original unit before ordering.