DENSO 12318645329 OEM BMW Alternator 12V Permanent Magnet Replacement

The DENSO 12318645329 is a genuine OEM-specification alternator designed as a direct replacement for BMW vehicles equipped with 2.0L gasoline engines. Manufactured by DENSO — a trusted original equipment supplier to BMW — this alternator restores proper charging system performance and is engineered to meet the precise electrical demands of the BMW charging architecture.

Key Specifications:

• Voltage: 12V
• Amperage: Up to 220A (application-dependent; configurations include 150A, 180A, 190A, and 220A)
• Unit Series: PMA (Permanent Magnet Alternator)
• Rotation: Clockwise (CW)
• Regulator / Fan Type: IR/IF (Internal Regulator / Internal Fan)
• Plug Orientation: Side
• Pulley Class: S6
• Pulley OD: 53.2mm

OEM & Cross-Reference Part Numbers:

• BMW OEM: 12-31-8-645-329 / 12318645329
• Replaces: 12-31-8-645-325, 12-31-8-645-326, 12-31-8-648-046, 12-31-8-648-047
• Cross-references: 0210802290, LRA04199, DAN1471, 104211-0611, 104211-0610

Key Features:

• Permanent magnet alternator design for improved efficiency and power output
• Internal regulator and internal fan for compact, self-contained operation
• Engineered to OEM specifications for reliable fit and performance
• Direct bolt-on replacement — no modifications required
• Supports BMW's demand-controlled charging system (ELV/intelligent alternator management)

This alternator is a critical component of the vehicle's charging system, responsible for keeping the battery charged and supplying power to the vehicle's electrical systems during engine operation. A failing alternator can cause battery drain, electrical malfunctions, and ultimately leave a vehicle inoperable. Replacing with an OEM-specification unit ensures compatibility with BMW's intelligent energy management systems.