OEX Alternator 12V 120A Mitsubishi Style MXA2057

The OEX Alternator MXA2057 is a new 12V, 120A unit in Mitsubishi style, supplied as an each item for rotating electrical applications. It uses an internal regulator, a 6 groove pulley, and a quad leg alternator mount, so the key physical and electrical details are already defined before you compare it with the vehicle.

Mounting dimensions matter with alternators, and this unit lists 45mm inside mounting legs, a 139mm mount centre to centre measurement, and M10x1.5 / 11 pivot and adjusting hole diameters. The pulley outside diameter is 55mm, which is important when matching belt alignment and fit against the existing unit.

OEX identifies this alternator as part number MXA2057, with pin code IR125 and a power rating of 120 amp. It suits Mitsubishi unit make according to the supplied application data, and it is backed by a 3 year passenger / 1 year commercial warranty.

For workshop or driveway replacement work, the safest approach is to compare the part number, mounting layout, pulley configuration, and electrical rating before ordering. These details are the practical checks that usually determine whether the alternator is the correct match for the vehicle and accessory drive set-up.

Key Features

• New alternator, not remanufactured
• 12V system
• 120A output
• Internal regulator
• 6 groove pulley
• Quad leg alternator mount

Specifications

• Brand: OEX
• Product type: Alternator
• Part No.: MXA2057
• Voltage: 12V
• Power rating: 120A
• Regulator type: Internal
• Pulley outside diameter: 55mm
• Pulley section: 6 groove

Fitment and application details

• Suits unit make: Mitsubishi
• Application data supplied against multiple vehicle makes and models, including Audi, BMW, Citroën, Jeep, Land Rover, Mazda, Mercedes-Benz, Mini, Peugeot, Porsche, Renault, Rover, Skoda, Volkswagen and Volvo
• Model examples listed in the supplied data include Audi A3 and A4, BMW 3 and X1, Citroën Berlingo, Jeep Wrangler, Land Rover 110/127, Mazda MX-5, Mercedes-Benz C-Class and CLA, Mini Clubman, Peugeot 207 and 3008, Porsche 911 and Boxster, Renault Master and Megane, Skoda Octavia and Yeti, Volkswagen Jetta, Passat and Transporter, and Volvo C70
• Fitment is not confirmed by model name alone and should be checked against the part number, mounting dimensions, pulley type and electrical rating

Application and Buying Notes

Before ordering, compare MXA2057 with the alternator already fitted to the vehicle, then check the 12V rating, 120A output, internal regulator type and 6 groove pulley section. Those items affect both electrical compatibility and belt fit, and they are more reliable than looking at vehicle make alone.

The mounting measurements are just as important. This alternator is listed with 45mm inside mounting legs, 139mm mount centre to centre, and M10x1.5 / 11 pivot and adjusting holes. If those measurements or the quad leg mounting layout differ from the removed unit, it may not install correctly even if the vehicle is shown in the broader application data.

Because the fitment list spans multiple makes and model families, it is best to use the part number MXA2057 together with the physical details above. That is especially important where the vehicle may have been built with more than one alternator option, or where belt arrangement and regulator style vary across engine variants.

Weight is listed at 5.98kg, which can also be a useful sanity check when comparing to the removed part. If the existing alternator is much lighter or heavier, or the pulley diameter differs from the 55mm specification, pause and confirm the application before fitting.

This unit is new and sold individually as each. It is covered by a 3 year passenger and 1 year commercial warranty, so it is worth keeping the invoice and installation record. Correct installation matters for warranty support as well as for long-term charging system reliability.

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 MXA2057 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 45mm, Pivot Hole Diameter M10x1.5 / 11, Pulley Outside Diameter 55mm, Regulator Type Internal, Voltage 12, Mount Cnt to Cnt 139mm, Weight 5.98kg.

Additional published details for cross-checking include Product Group 1 ROTATING ELECTRICAL, Part No. MXA2057, Brand OEX, Description OEX Alternator 12V 120A Mitsubishi Style, Adjusting Hole Diameter M10x1.5 / 11, Pin Code IR125, Power Rating (Amp) 120, Pulley Section 6 Groove, Suits Unit Make Mitsubishi, Alternator Mount Quad Leg.

OEX Alternator 12V 120A Mitsubishi Style. Part number MXA2057 should be checked first. Listed voltage is 12. Listed output rating is 120. These details form the core reference points used by parts interpreters when confirming the correct replacement.

Mount style is Quad 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 MXA2057, 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.

Compatibility note: Confirm compatibility using part number MXA2057, the Mitsubishi-style application, and the listed mounting and pulley dimensions before purchase. Vehicle model names in the application data should be treated as a guide only, not a guarantee of fit.

FAQ

What is the part number for this alternator?

The listed part number is MXA2057.

Is this alternator new or remanufactured?

It is listed as new.

What voltage and output does it have?

It is a 12V alternator with a 120A power rating.

Does it have an internal regulator?

Yes. The regulator type is listed as internal.

What pulley setup does it use?

It has a 55mm pulley outside diameter and a 6 groove pulley section.

What should I check before buying?

Check MXA2057, the Mitsubishi-style application, the 12V/120A rating, the quad leg mount, and the listed mounting measurements before ordering.