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Number 2 marks the part’s position in the exploded view.
3AA131878 Volkswagen Reduction Agent Tank
Stores and supplies reduction agent (like AdBlue) for the exhaust gas treatment system to reduce emissions.
Verify fitment by VIN or matching the part number before ordering.
3AA131878 VW Reduction Agent Tank Genuine OEM fits: Volkswagen CC 2012–2017; Volkswagen Passat/Variant/Santana 1974–present.
This list may not include every compatible vehicle. If you’re unsure, share your VIN and our fitment team will confirm the right part before you order.
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