OEX Alternator 12V 100A Denso Style DXA4178

The OEX alternator DXA4178 is a new 12V, 100A unit in a Denso style configuration, supplied as each. It is listed with a twin leg alternator mount, 36mm inside mounting legs, an M10x1.25 pivot hole diameter, and an M8x1.25 adjusting hole diameter.

This alternator suits Denso applications and carries a 4 groove pulley with a 62mm outside diameter. The unit weighs 5.16kg and is identified with pin code IR169, which can be useful when checking against the vehicle’s original charging system hardware.

There is an important identification note on this part: it is one of two identical looking alternators with different regulator functions. The recommended check is to confirm by OE number before ordering, as the external appearance alone is not enough to separate the variants.

Key Features

• New alternator, supplied each
• 12V, 100A output
• Denso style unit
• Twin leg alternator mount
• 4 groove pulley, 62mm outside diameter
• One of two identical looking alternators with different regulator functions

Specifications

• Brand: OEX
• Part number: DXA4178
• Product type: Alternator
• Voltage: 12V
• Power rating: 100A
• New / remanufactured: New
• Suits unit make: Denso
• Alternator mount: Twin leg

Fitment Guidance

• Fitment data supplied includes Toyota, Toyota Corolla, and Toyota iQ applications.
• Sample applications shown include Toyota Corolla 2015 and Toyota iQ 2009 to 2015.
• Use the OE number and the vehicle’s original alternator details to confirm the correct regulator function before ordering.

Application and Buying Notes

When checking this alternator, the key points are the part number DXA4178, the Denso style housing, and the note that there are two identical looking alternators with different regulator functions. That means matching the OE number is the safest way to separate the correct unit from the similar-looking alternative.

The mounting and pulley details matter as much as the electrical rating. This unit is 12V and 100A, with a twin leg mount, 36mm inside mounting legs, 160mm mount centre to centre, and a 4 groove pulley measuring 62mm outside diameter. Those dimensions need to line up with the existing alternator and drive arrangement on the vehicle.

Because the fitment group mentions Toyota, Toyota Corolla, and Toyota iQ applications, it is sensible to compare the original alternator closely before buying. Check the pin code IR169, the pivot hole M10x1.25, and the adjusting hole M8x1.25 against the vehicle’s fitted unit or service information.

This is a new alternator, not a remanufactured unit, and it is sold with a 3yr passenger and 1yr commercial warranty. Even with that coverage, the correct regulator function must still be verified first, since the listing specifically warns that there are two visually similar versions.

If the original alternator is still available, compare the mounting style, pulley groove count, and overall shape against this unit before fitting. The weight is 5.16kg, which can also help when comparing a replacement against the removed part for a quick sanity check.

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 DXA4178 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 36mm, Pivot Hole Diameter M10x1.25 / 10, Pulley Outside Diameter 62mm, Suits Unit Make Denso, Note One of two identical looking alternators, both with different regulator functions. Confirm by OE number., Mount Cnt to Cnt 160mm, Weight 5.16kg.

Additional published details for cross-checking include Product Group 1 ROTATING ELECTRICAL, Part No. DXA4178, Brand OEX, Description OEX Alternator 12V 100A Denso Style - See Note, Adjusting Hole Diameter M8x1.25, Pin Code IR169, Power Rating (Amp) 100, Pulley Section 4 Groove, Voltage 12, Alternator Mount Twin Leg.

OEX Alternator 12V 100A Denso Style - See Note. Part number DXA4178 should be checked first. Listed voltage is 12. Listed output rating is 100. These details form the core reference points used by parts interpreters when confirming the correct replacement.

Mount style is Twin Leg. Pulley configuration is 4 Groove. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number DXA4178, 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 100 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Available application references include TOYOTA COROLLA, TOYOTA COROLLA 2015, TOYOTA IQ, TOYOTA IQ 2009. Even with application listings, final confirmation should still be based on the exact unit being replaced and the service requirements of the vehicle or machine.

The listed warranty is 3yr Passenger 1yr Commercial. Warranty terms should be considered alongside correct application and part identification, as warranty does not replace fitment confirmation.

Compatibility note: Confirm compatibility using the OE number, regulator function, and the alternator dimensions listed here before ordering. The visual style alone is not enough to identify the correct unit.

FAQ

What is the part number for this alternator?

The part number is DXA4178.

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 100A power rating.

What style of alternator is it?

It is a Denso style alternator and suits Denso applications.

What should I check before ordering?

Confirm the OE number, regulator function, mounting details, and pulley specification. The note states that there are two identical looking alternators with different regulator functions.

What warranty is listed?

The listed warranty is 3yr passenger and 1yr commercial.