{"product_id":"x-autohaux-coolant-reservoir-tank-5q0121407a-with-cap-sensor-for-audi-vw-2012-2020","title":"X AUTOHAUX Coolant Reservoir Tank 5Q0121407A with Cap \u0026 Sensor for Audi\/VW (2012-2020)","description":"\u003cdiv\u003e\n  \u003ch2\u003eOverview\u003c\/h2\u003e\n  \u003cp\u003eIntroducing the X AUTOHAUX coolant reservoir tank, a robust aftermarket replacement engineered to align with OEM geometry and connector layouts for a range of Audi and Volkswagen models. This kit includes the cap and a 2-pin sensor, with the part number 5Q0121407A and compatible variations 5Q0121407D and 5Q0121407G where applicable. Built to withstand daily driving demands, it offers a reliable pathway to maintain proper coolant management within the cooling loop.\u003c\/p\u003e\n  \u003ch3\u003eWhy this reservoir matters\u003c\/h3\u003e\n  \u003cp\u003eIn everyday driving, the reservoir handles coolant expansion and return to the radiator, helping the cooling system respond to temperature swings during city commutes and longer highway drives. While no aftermarket part can guarantee a specific outcome, a properly matched reservoir may contribute to steadier engine temperatures and reduced stress on cooling components when the system is operating as intended.\u003c\/p\u003e\n  \u003ch3\u003eCompatibility and function\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eFits Audi A3 8VA\/8VF (2012–2020), plus related models such as Q2 (2016–2020), Q3 (2018–2020), TT MK3 (2014–2020), Arteon (2017–2020), Golf MK7 (2012–2020), Seat Ateca (2016–2020), and Passat 3G (2014–2020).\u003c\/li\u003e\n    \u003cli\u003eIncludes cap and a 2-pin sensor for straightforward installation and monitoring integration.\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003ch3\u003eWhat’s included and key features\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eReservoir tank, protective cap, and a 2-pin sensor.\u003c\/li\u003e\n    \u003cli\u003eDurable construction designed to resist rust, oxidation, fluid loss, and deformation over time.\u003c\/li\u003e\n    \u003cli\u003eOEM-match geometry to support safe mounting and hose connections.\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003ch3\u003eDurability and design details\u003c\/h3\u003e\n  \u003cp\u003eCrafted with rugged materials, this reservoir is built to endure the vibration and heat of daily driving. The included cap seals securely to minimize coolant loss, while the sensor provides a reliable signal for level checks under different engine temperatures.\u003c\/p\u003e\n  \u003ch3\u003eInstallation guidance\u003c\/h3\u003e\n  \u003col\u003e\n    \u003cli\u003eEnsure the engine is cool before starting; remove the bolts holding the old tank.\u003c\/li\u003e\n    \u003cli\u003eLet residual coolant drain into a pan, remove the old piece, and prepare the hose connections.\u003c\/li\u003e\n    \u003cli\u003ePosition the new reservoir, reconnect hoses, tighten clamps, and reinstall any mounting hardware.\u003c\/li\u003e\n    \u003cli\u003eRecheck all connections and perform a careful coolant refill, then run the engine to verify proper function.\u003c\/li\u003e\n  \u003c\/ol\u003e\n\u003c\/div\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Which vehicles is this coolant reservoir compatible with?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Compatible with Audi A3 8VA\/8VF (2012–2020), Q2 (2016–2020), Q3 (2018–2020), TT MK3 (2014–2020), Arteon (2017–2020), Golf MK7 (2012–2020), Seat Ateca (2016–2020), and Passat 3G (2014–2020).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What is included in the package and how do I install it?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Includes reservoir tank, cap, and 2-pin sensor. Follow steps: cool engine, drain coolant, swap tanks, reconnect hoses, refill, test.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"X AUTOHAUX","offers":[{"title":"Default Title","offer_id":42469059297365,"sku":"B0C53PSN48","price":53.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0632\/3270\/4597\/files\/x-autohaux-coolant-reservoir-tank-assembly.jpg?v=1778084512","url":"https:\/\/plentytorque.co.uk\/products\/x-autohaux-coolant-reservoir-tank-5q0121407a-with-cap-sensor-for-audi-vw-2012-2020","provider":"PlentyTorque","version":"1.0","type":"link"}