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Description
Alternator 12V 140A for VW Golf 5/6, Jetta 5/6 & Audi A3 - ALT1242AVehicle Fitment & Part Details This alternator (ALT1242A, OE 03L 903 023 F) fits a broad range of VAG platform vehicles including VW Golf 5 6 7, Jetta 4 5 6, Polo, Passat, Tiguan, Touran, Caddy, Transporter T5, Crafter, CC, Sharan, Scirocco, Beetle, Polo Vivo, and Audi A1, A3, A4, Q3, TT, S3, and RS3. The alternator generates electrical power and charges the battery while the engine runs. Confirm compatibility by matching the listed fitment details,
Vehicle Fitment & Part Details
This alternator (ALT1242A, OE 03L-903-023-F) fits a broad range of VAG platform vehicles including VW Golf 5/6/7, Jetta 4/5/6, Polo, Passat, Tiguan, Touran, Caddy, Transporter T5, Crafter, CC, Sharan, Scirocco, Beetle, Polo Vivo, and Audi A1, A3, A4, Q3, TT, S3, and RS3. The alternator generates electrical power and charges the battery while the engine runs. Confirm compatibility by matching the listed fitment details, OEM reference numbers, and VIN/engine/chassis information where variants exist.
Key Details
- SKU
- ALT1242A
- Component
- Alternator
OEM Reference Numbers
- VAG: 03L-903-023-F
- 03L-903-023F
- 03L903023F
- 03L-903-023-FX
- 03L903023FX
- 06F-903-023A
- 06F903023A
- 06F-903-023AX
- 06F903023AX
- 06F-903-023-C
- 06F-903-023C
- Mercedes-Benz: HVAG0001540102
- HVW 000 154 01 02
Product Specifications
| Specification | Value |
|---|---|
| Voltage | 12 V |
| Charging Current | 140 A |
| For Manufacturer (Regulator Type) | Valeo |
| Number of Ribs | 6 |
| Pulley | With freewheel (overrunning) belt pulley |
Vehicle Fitment
Includes 73 supplied applications.
View Full Vehicle Fitment (73 applications)
| Make | Model | Engine Code | Power | Years |
|---|---|---|---|---|
| Audi | A1 1.2 TFSi | CBZA | 71 kW | 2011- |
| Audi | A1 1.6 TDi | CAYB | 79.5 kW | 2011- |
| Audi | A1 1.6 TDi | CAYC | 79.5 kW | 2010-2015 |
| Audi | A1 1.2 TFSi Sportback | CBZA | 71 kW | 2012- |
| Audi | A1 1.6 TDi Sportback | CAYC | 79.5 kW | 2011- |
| Audi | A3 1.6 TDi | CAYC | 79.5 kW | 2010-2013 |
| Audi | A3 1.9 TDi | BLS, BXE, BK | 79.5 kW | 2008-2010 |
| Audi | A3 2.0 FSi | AXW, BMB | 82.5 kW | 2004-2005 |
| Audi | A3 2.0 TDi | BKD | 81 kW | 2003-2012 |
| Audi | A3 2.0 TDi | CBAB, CFFB | 81 kW | 2003-2012 |
| Audi | A3 2.0 TDi | BMM | 81 kW | 2005-2012 |
| Audi | A3 2.0 TFSi | AXX, CAWB | 82.5 kW | 2005-2013 |
| Audi | A3 1.6 TDi Sportback | CAYC | 79.5 kW | 2010-2013 |
| Audi | A3 1.9 TDi Sportback | BLS, BXE, BK | 79.5 kW | 2008-2010 |
| Audi | A3 2.0 FSi Sportback | BLX, BLY, BV | 82.5 kW | 2004-2005 |
| Audi | A3 2.0 TDi Sportback | BKD | 81 kW | 2004-2013 |
| Audi | A3 2.0 TDi Sportback | CBAB, CFFB | 81 kW | 2004-2012 |
| Audi | A3 2.0 TFSi Sportback | AXX, BWA, CA | 82.5 kW | 2004-2013 |
| Audi | A3 3.2 V6 Sportback | BDB, BUB, BM | 84 kW | 2004-2009 |
| Audi | A3 RS3 2.5 TFSi Quattro | CEPA | 82.5 kW | 2011-2013 |
| Audi | A4 1.9 TDi | AVF | 79.5 kW | 2001-2005 |
| Audi | Q3 2.0 TDi | CFFB, CLJA | 81 kW | 2012- |
| Audi | Q3 2.0 TDi Quattro | CFGC, CLLB | 81 kW | 2012- |
| Audi | S3 2.0 TFSi | BZC | 82.5 kW | 2007-2012 |
| Audi | TT 2.0 TFSI | BWA, BPY, CC | 82.5 kW | 2007-2010 |
| Audi | TT 2.0 TTS Quattro | CDLA, CDMA | 82.5 kW | 2008-2014 |
| Audi | TT 3.2 V6 | BHE | 84 kW | 2004-2006 |
| VW | Beetle 1.2 TSi | CBZB | 71 kW | 2011- |
| VW | Beetle 1.2 TSi | CYVD | 71 kW | 2014- |
| VW | CC 2.0 TDi | CFGB, CLLA | 81 kW | 2011-2013 |
| VW | CC 2.0 TDi | CFGC | 81 kW | 2013-2016 |
| VW | Golf 3 2.8 VR6 | AAA | 81 kW | 1993-1996 |
| VW | Golf 5 1.6 | BGU, BSF | 81 kW | 2004-2008 |
| VW | Golf 5 1.9 TDi | BKC, BXE | 79.5 kW | 2004-2008 |
| VW | Golf 5 2.0 Comfortline | BEV, BHY | 82.5 kW | 2005-2009 |
| VW | Golf 5 2.0 FSi | AXW | 82.5 kW | 2004-2008 |
| VW | Golf 5 2.0 FSi | BLY | 82.5 kW | 2004-2008 |
| VW | Golf 5 2.0 GTi | AXX, BWA, CA | 82.5 kW | 2004-2008 |
| VW | Golf 5 2.0 TDi | BKD | 81 kW | 2004-2008 |
| VW | Golf 6 1.6 TDi Comfortline | CAYC | 79.5 kW | 2009-2013 |
| VW | Golf 6 1.6 Trendline | BSE, BSF | 81 kW | 2009-2013 |
| VW | Golf 6 2.0 TSi GTi | CDLG | 82.5 kW | 2012-2013 |
| VW | Golf 6 2.0 TDi | CBAB | 81 kW | 2009-2013 |
| VW | Golf 6 2.0 TDi | CFFB, CJAA | 81 kW | 2009-2013 |
| VW | Golf 6 2.0 TSi R 4Motion | CDLC, CRZA | 82.5 kW | 2011-2013 |
| VW | Golf 7 2.0 TDi | CRVA, CYKB | 81 kW | 2013- |
| VW | Golf 7 2.0 TDi | CRLB/MB/BC | 81 kW | 2013- |
| VW | Jetta 4 1.6i | AKL | 81 kW | 1999-2004 |
| VW | Jetta 4 2.0i | APK, AZJ, AQ | 82.5 kW | 1999-2005 |
| VW | Jetta 4 2.3 V5 | AGZ | 81 kW | 1999-2001 |
| VW | Jetta 4 2.3 V5 | AQN | 81 kW | 2002-2005 |
| VW | Jetta 5 1.6 | BGU, BSE, BS | 81 kW | 2006-2010 |
| VW | Jetta 5 1.6 TDi | CAYC | 79.5 kW | 2009-2010 |
| VW | Jetta 5 1.9 TDi | BKC/BLS | 79.5 kW | 2006-2010 |
| VW | Jetta 5 2.0 FSi | BLR, BVY, BV | 82.5 kW | 2006-2010 |
| VW | Jetta 5 2.0 TFSi | BWA, BPY, CA | 82.5 kW | 2006-2010 |
| VW | Jetta 5 2.0 TDi | BMN, CEGA | 81 kW | 2006-2010 |
| VW | Jetta 5 2.0 TDi | BKD, CBDB | 81 kW | 2006-2010 |
| VW | Jetta 6 1.2 TSi | CBZB | 71 kW | 2011- |
| VW | Jetta 6 1.6 TDi | CAYC, CAYX | 79.5 kW | 2011-2015 |
| VW | Jetta 6 2.0 TDi | CFFB, CFHC | 81 kW | 2011- |
| VW | Passat 1.9 TDi | BKC/BLS | 79.5 kW | 2005-2009 |
| VW | Passat 2.0 FSi | BLR, BLY, BV | 82.5 kW | 2005-2008 |
| VW | Passat 2.0 TFSi | AXX, BWA, BP | 82.5 kW | 2005-2010 |
| VW | Passat 2.0 TDi | BKP, CBAB | 81 kW | 2005-2011 |
| VW | Passat 2.0 TDi | CBDC | 81 kW | 2009-2011 |
| VW | Passat 3.2 V6 | AXZ | 84 kW | 2005-2010 |
| VW | Polo 1.6i Sedan | BTS | 76.5 kW | 2006-2010 |
| VW | Polo 1.6i Sedan | BUD | 76.5 kW | 2006-2010 |
| VW | Polo 1.6 TDi | CAYB | 79.5 kW | 2009-2011 |
| VW | Polo 1.6 TDi | CAYC, CLNA | 79.5 kW | 2010- |
| VW | Polo 1.9 TDi | ASZ | 79.5 kW | 2006-2010 |
| VW | Polo Vivo 1.6i 5DR | CLSA | 76.5 kW | 2010-2017 |
| VW | Polo Vivo 1.6i Maxx | CLSA | 76.5 kW | 2013- |
| VW | Polo Vivo 1.6i 5DR | CLSA | 76.5 kW | 2018- |
| VW | Scirocco 2.0 TSi R | CDLC | 82.5 kW | 2011-2013 |
| VW | Sharan 1.8T | AJH, AWC | 81 kW | 1999-2002 |
| VW | Sharan 1.8T | AWC | 81 kW | 2002-2006 |
| VW | Sharan 1.9 TDi | ASZ | 79.5 kW | 2002-2006 |
| VW | Sharan 2.8 V6 | AYL | 81 kW | 2001-2006 |
| VW | Tiguan 2.0 TDi | CBAB, CFFB | 81 kW | 2008-2010 |
| VW | Tiguan 2.0 TDi | CFFD | 81 kW | 2011-2016 |
| VW | Touran 1.2 TSi | CBZB | 71 kW | 2011-2016 |
| VW | Touran 1.6 | BGU, BSF | 81 kW | 2007-2011 |
| VW | Touran 1.9 TDi | AVQ | 79.5 kW | 2004-2011 |
| VW | Touran 1.9 TDi | BKC, BLS, BX | 79.5 kW | 2004-2011 |
| VW | Touran 2.0 FSi | AXW | 82.5 kW | 2004-2007 |
| VW | Touran 2.0 TDi | BMM | 81 kW | 2005-2010 |
| VW | Touran 2.0 TDi | CLCA | 81 kW | 2011-2016 |
| VW | Caddy 1.6i | BGU, BSF | 81 kW | 2004-2015 |
| VW | Caddy 1.9 TDI | BJB, BLS | 79.5 kW | 2004-2010 |
| VW | Caddy 2.0 SDI | BDJ, BST | 81 kW | 2004-2010 |
| VW | Caddy 2.0 TDI | CFHF, CLCA | 81 kW | 2010-2016 |
| VW | Caddy 2.0 TDI DSG | CFHC | 81 kW | 2011-2015 |
| VW | Crafter 35 2.5 TDi SWB | BJK, CEBB | 81 kW | 2006- |
| VW | Crafter 35 2.5 TDi SWB | BJM, CECB | 81 kW | 2006- |
| VW | Crafter 50 2.5 TDi LWB | BJK, CEBB | 81 kW | 2006- |
| VW | Crafter 50 2.5 TDi LWB | BJM, CECB | 81 kW | 2006- |
| VW | Kombi T5 1.9 TDi 4C | AXB | 79.5 kW | 2004-2010 |
| VW | Transporter 1.9 TDI | AXB | 79.5 kW | 2005-2009 |
Fitment Notes
- Always match OEM reference number(s) and vehicle details before ordering. Confirm exact fitment using VIN, engine code, or chassis number if multiple variants exist.
- This alternator is specified with a Valeo-type regulator, 6-rib pulley, and overrunning (freewheel) belt pulley - confirm the removed unit matches these details before ordering.
Installation / Use / Maintenance Tips
- Disconnect the battery before removing or installing the alternator.
- Inspect the drive belt, tensioner, pulley alignment, and charging cables before fitting the new unit.
- Ensure the main B+ terminal and plug connections are clean and secure.
- After installation, verify charging voltage at idle and at load, and confirm no battery or charging warnings remain.
Common Questions
Will this alternator fit my VW or Audi?
This part (ALT1242A) is listed for the fitments shown on this page. Confirm by matching the fitment details, OEM number, and VIN/engine code where variants exist.
What OEM part numbers does this cross-reference?
Cross-reference numbers are listed in the OEM Reference Numbers section above. Match at least one to your original part before ordering.
How do I confirm fitment if there are multiple variants?
Use VIN, engine code, and chassis/platform details and compare them to the fitment section above. If unsure, request fitment assistance before ordering.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.7 ★★★★★
Based on 2284 reviews
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Product Reviews
★★★★★ 5
This Stuff Turned My Morning into a Rocket Launch – No Crash, Just Pure Chaos!
Flavor Name: Zero Ultra, Size: 16 Ounce (Pack of 24), Flavor Name: Zero Ultra, Size: 16 Ounce (Pack of 24)
I popped open my first can of this sparkling energy elixir expecting the usual lukewarm disappointment, but instead, it hit like a caffeinated unicorn tap-dancing on my taste buds. The flavor is ridiculously good – think tropical punch meets crisp citrus without that artificial "why did I do this" aftertaste. It's completely sugar-free, so no sneaky crash later, yet the carbonation is perfectly balanced: fizzy enough to feel exciting, but not so aggressive it turns your esophagus into a launchpad. Digestibility? Flawless. My stomach thanked me instead of staging a protest, which is a miracle for someone who once considered coffee a food group.
As for effectiveness, this bad boy delivers exactly what it promises and then some. The caffeine content is spot-on potent – enough to power through a soul-crushing workday or an impromptu home renovation project without the jitters or heart palpitations that usually come with high-octane drinks. I tackled my to-do list like a caffeinated superhero, all while staying hydrated and focused. Five stars for turning a regular Tuesday into an epic quest. If you're looking for clean, bubbly motivation in a can, stop scrolling and add this to your cart immediately. Your future self will high-five you.
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Reviewed in the United States on May 13, 2026
★★★★★ 5
Great taste without the sugar crash
Flavor Name: Zero Ultra, Size: 16 Fl oz (Pack of 15)
I picked this up because I wanted an energy drink that wouldn’t be loaded with sugar, and this one honestly surprised me. The flavor is really light and refreshing—not too sweet or overpowering like some other energy drinks.
I’ve been using it mainly in the mornings or when I need a quick boost, and it definitely helps with energy and focus without making me feel jittery. One thing I really like is that there’s no heavy aftertaste, which I’ve noticed with other sugar-free drinks.
Pros:
Zero sugar but still tastes good
Smooth, not too strong or artificial
Gives a noticeable energy boost
Cons:
Might be a little too mild if you like very strong flavors
The price can add up if you drink them often
Overall:
I’d recommend this if you want a cleaner-tasting energy drink without all the sugar. It’s easy to drink and does what it’s supposed to.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 3, 2026
★★★★★ 5
Great!
Flavor Name: Zero Ultra, Size: 16 Fl oz (Pack of 15)
Great price for this pack, saves money in the long run! The flavor is great and love the carbonation. The sugar free flavor is my favorite.
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Reviewed in the United States on May 28, 2026
★★★★★ 5
My go-to energy drink for years, no crashes or headaches
Flavor Name: Zero Ultra, Size: 16 Fl oz (Pack of 15)
Consistent energy, good taste, and no weird side effects
✔️ Sugar-free with no crash
✔️ No headaches or jittery feeling
✔️ Clean, smooth energy boost
✔️ Good flavor without being overly sweet
✔️ Reliable enough for long-term daily use
✔️ Subscription makes it easy to keep stocked
I’ve been buying Monster Zero Ultra for years and have it on subscription. It’s the one energy drink I consistently go back to. I've tried most others and they all leave me feeling weird.
I actually feel a noticeable energy boost from it, but without the downsides I’ve had with other drinks. No headaches, no weird jittery feeling, and no crash later on.
The flavor is also solid (this one and Ultra Violet are my go tos') , not overly sweet, and easy to drink regularly. I only buy sugar-free energy drinks, and this checks that box without sacrificing taste. I limit myself to one a day after the gym and water the rest of the day.
After trying a lot of different brands, this is the one that’s stayed consistent for me, which is why I’ve kept it on subscription.
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Reviewed in the United States on April 5, 2026
★★★★★ 5
Monster
Flavor Name: Zero Ultra, Size: 16 Fl oz (Pack of 15)
Great price. Cheaper than the store. Zero sugar is a game changer!
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Reviewed in the United States on May 15, 2026