{"product_id":"automotive-replacement-part-4m0121321k-4m0121321q-compatible-with-volkswagen-audi-1055310331507","title":"4M0121321K Coolant Expansion Tank Cap Compatible with Selected Audi Volkswagen Models","description":"\u003cp\u003eThis coolant expansion tank cap is a replacement part compatible with selected Audi and Volkswagen models. It is designed to replace a cracked, leaking, loose, or worn coolant reservoir cap and help maintain proper cooling system pressure.\u003c\/p\u003e\n\u003cp\u003eFeatures:\u003cbr\u003e- Compatible with selected Audi and Volkswagen vehicles\u003cbr\u003e- Replacement for part numbers: 4M0121321K, 4M0121321Q, 4M0121321J\u003cbr\u003e- Also commonly referenced as: 4M0 121 321 K, 4M0 121 321 Q\u003cbr\u003e- Helps seal the coolant expansion tank \/ coolant reservoir\u003cbr\u003e- Helps maintain proper cooling system pressure\u003cbr\u003e- Suitable for replacing a leaking, damaged, cracked, or worn coolant tank cap\u003cbr\u003e- Direct replacement style for easier installation\u003cbr\u003e- Commonly used on selected Audi A4, A5, A6, A7, A8, Q5, Q7, Q8 and Volkswagen models depending on configuration\u003c\/p\u003e\n\u003cp\u003ePackage Includes:\u003cbr\u003e- 1 x Coolant Expansion Tank Cap\u003c\/p\u003e\n\u003cp\u003eNote:\u003cbr\u003ePlease verify the part number, vehicle model, year, engine size, coolant tank style, and cap appearance before purchase. Compatibility may vary by model year, engine type, and market version. This is a coolant expansion tank cap, not a fuel tank cap or engine oil filler cap. Professional installation is recommended. This is a replacement part compatible with Audi and Volkswagen vehicles and is not an official Audi or Volkswagen-branded product unless specifically stated.\u003c\/p\u003e\n\u003c!-- staceedress-product-faq-start --\u003e\n\u003csection class=\"product-faq product-faq--fitment\"\u003e\n\u003ch3\u003eProduct FAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eFitment summary:\u003c\/strong\u003e Automotive Replacement Switch; OE\/OEM 4M0121321K, 4M0121321Q, 1055310331507; compatible with Volkswagen \/ Audi OE-number match required. Verify the OE\/OEM number and connector before ordering.\u003c\/p\u003e\n\u003cdiv class=\"product-faq__item\"\u003e\n\u003ch4\u003eWill this Automotive Replacement Switch fit my vehicle?\u003c\/h4\u003e\n\u003cp\u003eThis Automotive Replacement Switch is intended for vehicles that match OE\/OEM part number(s) 4M0121321K, 4M0121321Q, 1055310331507. Confirm your vehicle brand, model, year range, engine\/trim, connector and installation position before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-faq__item\"\u003e\n\u003ch4\u003eHow do I confirm compatibility for 4M0121321K, 4M0121321Q, 1055310331507?\u003c\/h4\u003e\n\u003cp\u003eCheck the number printed on your original part and compare it with this listing's SKU, MPN, OE\/OEM numbers and product photos. OE number matching is usually more reliable than matching by model name only.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-faq__item\"\u003e\n\u003ch4\u003eWhat vehicles is this Automotive Replacement Switch commonly associated with?\u003c\/h4\u003e\n\u003cp\u003eFitment references from this listing indicate compatibility with Volkswagen \/ Audi; model reference: OE-number match required; year reference: the matching year range; engine\/trim reference: the matching engine or trim. Fitment can still vary by market and trim.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-faq__item\"\u003e\n\u003ch4\u003eWhat should I compare before ordering this Automotive Replacement Switch?\u003c\/h4\u003e\n\u003cp\u003eCompare connector shape, pin count, button layout, mounting clips, side\/location, and housing shape. For this listing, also verify the matching installation position and Match original connector shape and pin count. If any detail differs from your original part, contact us before installation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-faq__item\"\u003e\n\u003ch4\u003eWhat symptoms can a failing Automotive Replacement Switch cause?\u003c\/h4\u003e\n\u003cp\u003eA failing or incorrect Automotive Replacement Switch may cause intermittent control response, no response from the controlled function, or electrical control faults. Symptoms alone do not confirm fitment, so verify the OE\/OEM number and physical part details first.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-faq__item\"\u003e\n\u003ch4\u003eCan I send my VIN or original part photo for fitment help?\u003c\/h4\u003e\n\u003cp\u003eYes. Email your VIN, original OE\/OEM part number, vehicle year\/make\/model\/engine, product link and clear photos of the original part and connector to info@staceedress.com.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-faq__item\"\u003e\n\u003ch4\u003eIs this an OEM or genuine branded part?\u003c\/h4\u003e\n\u003cp\u003eNo. This is an aftermarket replacement auto part supplied by Staceedress Auto Parts. Brand names and vehicle names are used only to describe compatibility.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-faq__item\"\u003e\n\u003ch4\u003eWhat should I check before installation?\u003c\/h4\u003e\n\u003cp\u003eBefore installation, compare the new part with your original part side by side, especially connector shape, pin count, button layout, mounting clips, side\/location, and housing shape. Installed, modified, damaged, or used electrical parts may not be eligible for return unless defective or incorrectly shipped.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c!-- staceedress-product-faq-end --\u003e","brand":"Staceedress Auto Parts","offers":[{"title":"Default Title","offer_id":47909196726425,"sku":"SD-4M0121321K-1055310331507","price":14.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0694\/2847\/8105\/files\/O1CN01Pg43ne1YMfAEpDpgL__2217553733045-0-cib.jpg?v=1781486448","url":"https:\/\/staceedress.com\/products\/automotive-replacement-part-4m0121321k-4m0121321q-compatible-with-volkswagen-audi-1055310331507","provider":"Staceedress Auto Parts","version":"1.0","type":"link"}