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OE number 078121601B corresponds to an electronic auxiliary coolant pump from the Volkswagen Group (VAG).
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Although the car water pump has a simple structure, it is the power source for the engine cooling system and is crucial to the engine’s health. Understanding its function, working principle, and common faults helps car owners to identify potential problems in a timely manner and perform proper maintenance, thus avoiding major issues and protecting the expensive engine.
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- OE number 078121601B corresponds to an Electric Auxiliary Coolant Pump from the Volkswagen Group (VAG).
- This component is a core auxiliary element of the cooling system, primarily used in large-displacement engines (especially V6 and V8). It maintains coolant circulation electrically driven during low-speed, high-load, or engine-off conditions.
- 1. Core Product Information
- Component Name: Electric Auxiliary Coolant Pump / Auxiliary Cooling Circulation Pump / Parking Heater Pump.
- Operating Mode: Electric (independent of the main mechanical water pump).
- Voltage: 12V.
- Plug Specification: Typically equipped with a 2-pin electrical connector.
- Main Function: Prevents localized engine overheating, especially in poorly ventilated areas between cylinder blocks of V-type engines, and assists the HVAC heating system.
- 2. Applicable Brands and Models
- This OE designation is widely used in mid-to-high-end models from Volkswagen, Audi, and Skoda manufactured from the late 1990s to the early 2010s, primarily equipped with 2.4L V6, 2.8L V6, and 4.2L V8 engines:
- Audi:
- A4/S4 (B5, B6, B7) (1995–2008): 2.4L V6, 2.8L V6, 4.2L V8.
- A6/S6 (C5, C6) (1998–2011): 2.4L V6, 2.8L V6, 4.2L V8.
- A8/S8 (D2, D3) (1994–2010): 2.8L V6, 3.7L V8, 4.2L V8.
- Allroad (2000–2005): 2.7T V6.
- A6 Avant (1998–2005): 2.4L, 2.8L.
- A8L (2004–2007): 4.2L.
- Volkswagen:
- Passat (B5) (1998–2005): 2.8L V6 engine.
- Phaeton (2002–2010): 3.2L/4.2L V8 engine.
- Skoda:
- Superb (2002–2008): 2.8L V6 engine.
- 3. Similar/Replacement OE Numbers
- The following part numbers are typically available as replacements or related models in the aftermarket or spare parts inventory:
- 078 121 601 (Base model)
- 078 121 601 A
- 1J0 965 561 A (Similar function in some applications)
- 3D0 965 561 D
- 4. Common Aftermarket Brands and References
- Original equipment suppliers typically include Pierburg or Bosch. Common aftermarket brands include:
- PIERBURG: 7.02078.37.0
- Febi Bilstein: 18073
- Bosch: 0392020039
- Maintenance Recommendation: When this auxiliary water pump fails, the vehicle may display an engine overheat warning or store a fault code related to “auxiliary water pump open circuit.” It is recommended to replace it promptly after verifying the model using the VIN code.
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