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Alternator Bosch 12V 140A | 6-Groove | 2P | L-DFM | IR/IF | E8
Audi A3 / A4 / S3 / TT • VW Golf V / VI • Seat & Skoda — ALT1242CX
High Output. OEM Precision. Built for European Performance.
Product Overview
The ALT1242CX Bosch Alternator is an OEM-grade charging unit engineered to deliver reliable, high-efficiency electrical power for modern European passenger vehicles. With a robust 140A output and a 6-groove pulley, the unit is optimized to support advanced electrical systems, infotainment, safety electronics, and comfort features found in Audi, Volkswagen, Seat and Skoda platforms.
Manufactured to Bosch standards, this alternator combines superior thermal management, precise voltage regulation, and durable construction to ensure consistent performance under highway loads and urban stop-start driving.
Applications
Designed as a direct replacement or upgrade for models including (but not limited to):
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Audi: A3, A4, S3, TT
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Volkswagen: Golf V, Golf VI
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Seat 1.6L – 2.8L
- Skoda 1.6L – 2.0L
(Always verify engine / part compatibility with vehicle VIN or OEM cross-reference.)
Key Features & Benefits
✔ High Output — 140A Charging Capacity
Supports demanding electrical loads, ensuring battery maintenance and stable performance for modern vehicle electronics.
✔ 6-Groove Pulley Design
Improves belt traction and reduces slippage for quieter, more efficient operation and longer belt life.
✔ 2-Pin (L-DFM) Connection
Standardized plug interface for easy installation and accurate vehicle communication (load/field monitoring).
✔ Internal Regulator & Internal Fan (IR/IF)
Advanced internal voltage regulation plus integrated cooling for reliable performance under prolonged or heavy load conditions.
✔ E8 / E-Marked Compliance
Meets recognized European electrical and safety standards—suitable for OEM-level replacement.
✔ Bosch Quality Construction
Precision engineering, superior bearings, and corrosion-resistant materials provide extended service life and dependable daily performance.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | ALT1242CX |
| Brand | Bosch |
| Voltage | 12V |
| Maximum Output | 140A |
| Pulley | 6-Groove |
| Connector | 2P (L-DFM) |
| Regulator / Fan | IR/IF (Internal Regulator / Internal Fan) |
| Certification | E8 / European compliant |
| Applications | Engine – 1Z, ADY, AHU, AJH, ANU, ASZ, ATM, AUE, AUY, AVB, AVF, AVQ, AWC, AWX, AXA, AXB, AXC, AXW, AXX, AXZ, AYL, AZV, BDB, BDJ, BDK, BEE, BGU, BHY, BHZ, BJB, BJJ, BJK, BJL, BJM, BKC, BKD, BKE, BKP, BLB, BLR, BLS, BLV, BLX, BLY, BMA, BMB, BMJ, BMM, BMN, BMP, BMR, BNA, BPW, BPY, BRB, BRC, BRD, BRE, BRF, BRM, BRR, BRS, BRT, BRU, BSE, BSF, BST, BSU, BSX, BTB, BUB, BUY, BUZ, BVA, BVD, BVE, BVF, BVG, BVH, BVK, BVX, BVY, BVZ, BWA, BWA1, BWJ, BWV, BXE, BXF, BXJ, BYD, BZC, CAVD, CAWB, CAYA, CAYB, CAYC, CAYD, CAYE, CBAA, CBAB, CBAC, CBBA, CBBB, CBDA, CBDB, CBDC, CBEA, CBFA, CBPA, CBRA, CCSA, CCTA, CCZA, CDLA, CDLB, CDLC, CDLD, CDLF, CDLG, CDLJ, CDMA, CEBA, CEBB, CECA, CECB, CEGA, CFFA, CFFB, CFFD, CFGB, CFGC, CFHA, CFHB, CFHC, CFHD, CFHE, CFHF, CFJA, CHGA, CJAA, CKJA, CLCA, CLCB, CLJA, CLLA, CLNA, CMXA, CRZA, CUUA, CUVE, DFSA. |
Why Choose ALT1242CX?
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OEM-level reliability from a world-leading alternator manufacturer.
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Stable, high-capacity charging for modern electronics and accessory loads.
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Durable under real-world conditions — ideal for daily drivers and performance vehicles.
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Easy direct fit replacement for quick installation and minimal downtime.
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Cost-effective upgrade to restore charging efficiency and prolong battery life.
Installation & Maintenance Tips
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Confirm fitment with vehicle VIN or OEM cross-reference before installation.
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Inspect drive belt and tensioner; replace worn belts to ensure optimal alternator performance.
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After installation, verify charging voltage (engine idling: ~13.8–14.6V) and perform load tests as needed.
Upgrade your vehicle’s charging system with the Bosch ALT1242CX today.