Magneti Marelli Auxiliary Water Pump for EA111 1.4 TSI Twincharger with Post-Run Cooling Protection and OEM Standard Fitment
The Magneti Marelli Water Pump Assembly (OEM Numbers: 03C121004J / 03C 121 004 J) is a premium-quality, direct replacement auxiliary coolant pump engineered specifically for Volkswagen Group vehicles equipped with the EA111 1.4 TSI twincharger engine.
Electronically controlled auxiliary water pump for EA111 1.4 TSI twincharger engines. Circulates coolant post-shutdown to prevent heat soak, protect turbocharger bearings, and maintain stable operating temperature.
| Part Number: | 03C121004J | Product Name: | Water Pump |
|---|---|---|---|
| Car Model: | VW Golf Jetta Audi | Engine Model: | VW TSI Twincharger |
| Condition: | 100% Brand New | Size: | Standard |
| Weight: | Standard | Origin: | China Mainland |
| Main Market: | Middle East, Asia, Africa, South America, North America & Europe | ||
| Package: | Neutral Packing Or Make It As Requested | ||
| Material: | High-strength aluminum alloy & precision bearings | Cooling Type: | Engine coolant circulation |
| Installation: | Direct OEM replacement | Quality Standard: | OEM equivalent / ISO quality control |
- OE Quality: Manufactured by Magneti Marelli to strict OEM dimensional, electrical, and hydraulic standards
- EA111 Twincharger Specific: Precisely engineered for 1.4 TSI twincharger engine architecture
- Post-Run Cooling Protection: Prevents localized boiling and extends turbocharger life by up to 50,000 km
- Prevents Limp Mode: Restores full cooling system functionality and clears associated DTCs
- Precision Electrical Interface: 2-pin connector matches factory wiring harness
- Sealed, Long-Life Electric Motor: Rated for >10,000 start-stop cycles
- Direct Replacement: Simple unbolt-and-replace installation
- Global Compatibility: Interchangeable with multiple OE part numbers
- Long Service Life: Designed for 150,000 km+ of normal operation
- Quality Certified: ISO 9001:2015 / IATF 16949 Certified manufacturing
| Symptom | Likely Cause | Action |
|---|---|---|
| Gurgling / boiling sounds after engine shutdown | Auxiliary pump not running — heat soak causing coolant to boil | Replace pump; verify electrical supply |
| Check Engine Light with DTC P261A / P261B / P2681 | Pump circuit open, short, or pump not responding | Check fuse, relay, wiring; replace pump if seized |
| Turbocharger oil leak (seal failure) | Excessive turbo bearing temperature due to inadequate post-run cooling | Replace pump and turbocharger (if damaged) |
| No pump operation audible after engine off | Pump motor seized or electrical failure | Replace pump; inspect relay and fuse |
| Engine overheats only in stop-start traffic | Auxiliary pump not providing supplemental coolant flow | Replace pump; flush cooling system |
| Intermittent coolant level warnings | Pump seal leaks causing slow coolant loss | Replace pump and O-ring; inspect hoses |
- Individual Packaging: Factory-sealed in anti-static/moisture-barrier bag with OE-style part labeling
- Wholesale/Bulk Orders: Available in case packs (10, 20, 50 units) with pallet pricing for volume orders
- Customization: Neutral or private-label retail packaging available for volume wholesale orders
- Fast Shipping: Ready stock for immediate dispatch worldwide
- Wholesale Support: Long-term supply agreements and tiered commercial pricing available
For pricing, availability, or bulk purchase of the Magneti Marelli Auxiliary Water Pump 03C121004J for VW EA111 1.4 TSI Twincharger applications, please contact our sales team for a competitive wholesale quote and expert technical support. We respond to all inquiries within 24 hours.
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