Valeo 439574 Alternator

Valeo OE Alternator for Audi and Volkswagen

The Valeo 439574 is a 12-volt, 150-amp alternator built for OE-style charging performance in select Audi and Volkswagen applications. It uses an internal fan, internal regulator, clockwise rotation, and a 6-groove pulley to match the original charging system layout.

As part of the Valeo OE alternator family, this unit reflects Valeo’s long history in electrical systems and original equipment supply. The aluminum housing supports a durable, lightweight design, while the 100% new construction helps reduce the risk associated with remanufactured units.

Key Features

• Part number: 439574
• 12-volt alternator with 150-amp output
• Internal fan and internal voltage regulator
• Clockwise rotation with 6-groove pulley
• Aluminum housing for OE-style fit and finish
• Valeo OE family construction
• Technical number: TG15C043

Product Details

Valeo alternator 439574 is engineered for direct replacement use in vehicles that require a 150-amp charging system. It is listed for Audi A4, Audi A4 Quattro, Audi A6, Audi A6 Quattro, and Volkswagen Passat applications, including specific chassis breakpoints noted in the fitment data. This makes it a strong match for buyers searching for an Audi A4 alternator 150 amp, an Audi A6 Quattro charging replacement, or a Volkswagen Passat alternator by part number 439574.

This part cross-references Bosch 15540 and Remy 11159 for the same application.

Common Issues This Part Can Address

• Low battery charging output
• Battery warning light or charging system warning
• Dim lights caused by weak alternator output
• Electrical instability from a failing alternator
• Noise or irregular charging from worn internal components

Installation Notes and Tips

• Verify the vehicle’s chassis/VIN breakpoint before ordering, especially on 2005 Audi A4 and A4 Quattro applications.
• Confirm pulley groove count, rotation direction, and amperage rating against the original unit.
• Inspect the belt, battery condition, and charging cables during replacement to avoid repeat charging issues.
• Clear any stored charging-system fault codes after installation and test system voltage at idle and under load.

Quality Assurance

Valeo is a recognized OE supplier in electrical systems, and this alternator is built as a 100% new unit rather than a remanufactured assembly. That construction supports consistent charging performance for Audi and Volkswagen vehicles that call for the Valeo OE alternator design.