Product Name: BMW High-Output Alternator (Generator) 170A OE / Cross-Reference Numbers: 12317626153 / 12317626155 / 1042106520 / 1042106521 / 1042106522 / 0210801090 / DAN1133 / AL9451X / LRA04309 / LRA4309 / 0986CR6232 / 0986UR6232 / 210801090 / etc. (and related Denso/BMW equivalents) Brand Compatibility: Denso OEM-quality (new or premium remanufactured) – matches BMW genuine specifications Key Specifications:
- Voltage: 12V (14V charging system)
- Output Current: 170A (high-output for enhanced electrical demands)
- Pulley: 7-groove freewheel belt pulley (overrunning alternator pulley / OAP), diameter ≈49mm
- Rotation: Clockwise (CW)
- Regulator: IR/IF (Internal Regulator / Internal Fan) with LIN/COM interface for BMW electronics
- Mounting: 4 mounting holes / direct bolt-on
- B+ Connection: M8
Compatible Vehicles (common applications – always verify with VIN or dealer):
- BMW 1 Series (E82/E88 Coupe/Convertible, F20/F21 Hatch) 135i / 135is N55 2012–2013
- BMW 3 Series (E90/E91/E92/E93, F30/F31/F34) 335i / 335i xDrive N55 2012–2015
- BMW X1 (E84) xDrive35i N55 2013–2015
- Other BMW models with N55 3.0L turbo engine (e.g., select Z4 or export variants)
Product Highlights:
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High 170A Output — Provides robust, consistent charging to support performance features like adaptive suspension, premium audio, navigation, LED/multibeam lighting, and turbo engine electronics without voltage drops or battery drain – ideal for N55 turbo models with high electrical loads.
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Exact OEM Fit — Bolt-on replacement for BMW part 12317626153 / 12317626155 / Denso 1042106520 / 1042106521. No modifications required; fully compatible with vehicle ECU and diagnostics.
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Quiet & Durable — Freewheel pulley reduces belt noise, wear, and vibrations for smooth, long-lasting performance in premium turbo applications.
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Premium Quality — Denso-tested for heat endurance, overspeed, and full-load reliability to match OE standards in demanding conditions.
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Excellent Value — Genuine BMW alternators are expensive – this high-spec replacement delivers identical performance at a more competitive price.
Installation Notes:
- Professional installation recommended (engine bay access in these models).
- Inspect serpentine belt, tensioner, and battery condition before fitting.
- After installation: Clear codes with BMW diagnostic tool (e.g., ISTA) and verify charging voltage (typically 13.8–14.8V under load).
🔥 BMW 135i / 335i / X1 170A Alternator – N55 Turbo Charging Beast! OE Cross: 1042106520 / 1042106521 / 12317626153 / 12317626155 – Denso Premium Match! Perfect for 2012–2015 N55 3.0L turbo models (135i E82/F22, 335i E90/F30, X1 E84) – ends dim lights, weak charging, or electrical strain on your performance BMW!
- 170A massive high-output
- 7-groove freewheel pulley – quiet & durable
- Direct OEM replacement
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