059 121 012 B 059 121 012 A 06D 121 601 958 106 313 00 (Porsche-related number) 9A7 121 601 A
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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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- The general-purpose OE number 059 121 012 B corresponds to the Electric Auxiliary Coolant Pump from the Volkswagen Group (VAG), widely used in mid-to-high-end models from Audi, Volkswagen, and Porsche.
- 1. Core Product Information
- Component Name: Electric Auxiliary Coolant Pump / Additional Cooling Circulation Pump / Parking Heater Pump.
- Operating Type: Electric, independently driven by the main engine belt.
- Voltage: 12V.
- Main Functions: Prevents turbocharger damage due to excessive residual heat after engine shutdown; assists in cooling the Exhaust Gas Recirculation (EGR) system; and supports cabin heating recirculation.
- 2. Applicable Brands and Models
This OE number is widely used in high-end models from Volkswagen, Audi, and Porsche manufactured between 2007 and 2022, especially vehicles equipped with 2.0 TSI/TFSI and 3.0 TDI/TFSI V6 engines. Audi: - A4/A4 allroad (2013–2016): 2.0T and 3.0 TDI models.
- A5 (2012–2017): 2.0T and 3.0 TDI models.
- A6 (2012–2015): 2.0T and 3.0 TDI models.
- Q5 (2013–2017): 2.0T and 3.0 TDI models.
- Q7 (2009–2012): 3.0 TDI model.
- Volkswagen:
- Touareg (2011–2017): Multiple engine options including 2.0T, 3.6L V6, and 3.0 TDI.
- Amarok: Some TDI models.
- Atlas: Some 2.0L models.
- Porsche:
- Cayenne (2011–2018): Models with some VAG engines (e.g., 3.0TDI).
- Macan: Models with some VAG engines.
- Panamera: Models with some VAG engines.
- 3. Compatible/Replacement OE Numbers
- 059 121 012 A
- 06D 121 601
- 958 106 313 00 (Porsche-related number)
- 9A7 121 601 A (Porsche-related number)
- 4. Common Aftermarket Brands
- The main original equipment suppliers (OE) for this part include Pierburg and Buehler. Common aftermarket brands include: PIERBURG and Febi Bilstein. Maintenance recommendations: Because this pump is directly related to the cooling safety of high-performance engines, it is recommended to use the VIN code to verify the part model and replace it promptly when a “cooling system fault” alarm is detected or performance deterioration occurs.



















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