2010-2015 Audi Diesel Exhaust Fluid Tank / Def Reservoir (PASSIVE) 4L0131877C

The Diesel Exhaust Fluid (DEF) Tank / Reservoir (OEM Part Number 4L0131877C) is essential for maintaining the emissions performance of compatible Audi Q7 models from 2010 to 2015. Located in the undercarriage, this passive tank supports the SCR (Selective Catalytic Reduction) system by storing and delivering DEF to reduce harmful nitrogen oxide emissions. Common issues include leaks or malfunctions due to wear and tear, which can lead to decreased performance or increased emissions, triggering warning lights on the dashboard. This genuine OEM part ensures optimal efficiency and compliance with environmental standards across various engine configurations, including the 3.0L V6 and 4.2L V8. Interchangeable with part numbers 4L0131877B, 4L0131879A, and others, this factory-original reservoir is sourced directly from donor vehicles, guaranteeing reliability and performance.