Remy 11121 Alternator

Remanufactured Alternator for BMW Charging Systems

The Remy Premium Remanufactured Alternator, part number 11121, is a 12-volt charging component built for select BMW applications with a 170 amp output. It features an internal fan, internal voltage regulator, clockwise rotation, and an included pulley for direct replacement use.

Compatible With BMW 320i, 320i xDrive, X3, 228i, 228i xDrive, 328i, 328i GT xDrive, 328i xDrive, 428i, 428i Gran Coupe, 428i xDrive, 428i xDrive Gran Coupe, 528i, 528i xDrive, and Z4 applications listed below. Remy 11121 also cross-references BMW 12-31-7-605-478 for the same application.

Key Features

• 170 amp amperage rating for BMW charging-system replacement needs
• 12V remanufactured alternator with internal voltage regulator
• Internal fan design for OE-style cooling layout
• Clockwise rotation
• Pulley included
• OE manufacturer reference: Nippondenso
• Premium Remanufactured product line from Remy

Detailed Description

Remy 11121 is a premium remanufactured alternator engineered for BMW vehicles originally equipped with a Nippondenso-style charging unit. The 170 amp output, internal regulator, and internal fan configuration match the electrical requirements of the listed BMW 320i, 328i, 528i, X3, 228i, 428i, and Z4 applications. This alternator is a practical OE-style replacement for restoring stable charging performance in vehicles that rely on a high-output 12-volt system.

The Remy Premium Remanufactured line focuses on replacement parts that follow original equipment specifications closely, making this unit a strong fit for BMW charging-system service where correct rotation, voltage control, and pulley configuration matter. Part number 11121 is also referenced against BMW 12-31-7-605-478 and related Nippondenso numbers for the same application.

Vehicle Fitment

• Fits 2013-2018 BMW 320i, N/A; Std; 170 Amps; Premium Remanufactured
• Fits 2013-2018 BMW 320i xDrive, N/A; Std; 170 Amps; Premium Remanufactured
• Fits 2013-2017 BMW X3, N/A; Std; 170 Amps; Premium Remanufactured
• Fits 2014-2016 BMW 228i, N/A; Std; 170 Amps; Premium Remanufactured
• Fits 2015-2016 BMW 228i xDrive, N/A; Std; 170 Amps; Premium Remanufactured
• Fits 2012-2016 BMW 328i, N/A; Std; 170 Amps; Premium Remanufactured
• Fits 2014-2016 BMW 328i GT xDrive, N/A; Std; 170 Amps; Premium Remanufactured
• Fits 2013-2016 BMW 328i xDrive, N/A; Std; 170 Amps; Premium Remanufactured
• Fits 2014-2016 BMW 428i, N/A; Std; 170 Amps; Premium Remanufactured
• Fits 2015-2016 BMW 428i Gran Coupe, N/A; Std; 170 Amps; Premium Remanufactured
• Fits 2014-2016 BMW 428i xDrive, N/A; Std; 170 Amps; Premium Remanufactured
• Fits 2015-2016 BMW 428i xDrive Gran Coupe, N/A; Std; 170 Amps; Premium Remanufactured
• Fits 2012-2016 BMW 528i, N/A; Std; 170 Amps; Premium Remanufactured
• Fits 2012-2016 BMW 528i xDrive, N/A; Std; 170 Amps; Premium Remanufactured
• Fits 2012-2016 BMW Z4, N/A; Std; 170 Amps; Premium Remanufactured
• Fits 2012 BMW 320i, N/A; 170 Amps; Premium Remanufactured

Common Replacement Uses

• Restores charging output when the battery warning light is on
• Addresses low-voltage conditions caused by alternator wear
• Replaces a noisy, failing, or inconsistent charging unit
• Helps correct dim lights and electrical instability during driving
• Supports proper battery charging in BMW 320i, 328i, 528i, X3, 228i, 428i, and Z4 models

Installation Notes and Tips

Verify the OE manufacturer reference, amperage rating, rotation direction, and pulley configuration before installation. Confirm the vehicle uses the listed standard application and compare the existing unit to Remy 11121 to ensure connector and mounting match. Inspect the battery, belt condition, and charging circuit before final startup so the replacement alternator can be evaluated under normal operating load.

Quality Assurance

Remy Premium Remanufactured parts are remanufactured to support OE-style replacement needs for electrical and charging systems. This alternator is built around the listed specifications for BMW applications and the Nippondenso OE reference.