The water pump 03C121008H is a replacement part designed for the DAG 1.4T engine. Below is an introduction to its applicable vehicle models, production years, and engine displacements:

Audi A3:
The 3rd-generation Audi A3 was launched in 2012, based on the MQB platform, and the Chinese-market version was equipped with a 1.4T four-cylinder engine. The 4th-generation Audi A3 hit the market in 2020, built on the MQB evo platform; some variants feature electric drive systems, while 1.4T models still remain available. Currently, the 2025 Audi A3 is offered with a 1.4T displacement, including models such as the Sportback 35TFSI and A3L Limousine 35TFSI.
Volkswagen Golf:
The Golf 7 was introduced in 2013, with some variants fitted with a 1.4T engine (including regular versions and R-Line versions). Among them, the 2016 1.4TSI Automatic R-Line was equipped with a 150-horsepower engine, while the 2016 1.4TSI 25th Anniversary Edition came with a 131-horsepower engine. The Golf 8 was released around 2020; the 2025 Volkswagen Golf still includes 1.4T models, such as the facelifted 300TSI.
Volkswagen Tiguan:
In November 2011, Volkswagen Tiguan launched its first 1.4T model, powered by the EA111 engine (maximum power: 131 horsepower, peak torque: 220 N·m). In June 2013, the mid-cycle facelifted Tiguan offered the 1.4T model under the BlueMotion variant. In 2016, Tiguan Silk Road Edition models with a 1.4T+DSG powertrain were released, such as the 2016 280TSI Automatic Silk Road Trendline and 2016 280TSI Automatic Silk Road Comfortline.

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