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OE Replacement: Direct replacement for part number 01V 321 241
Make Model Years Engine Audi S4 2004–2009 4
6L Quantity Sold Each
drain transmission fluid and install using new O-rings if supplied
The secondary air injection pump injects fresh air into the exhaust stream to further burn off exhaust gas
DENSO Air / Fuel Ratio Sensor – Upstream (234-5719) for VW Jetta ATE OE Replacement: Direct replacement forThe DENSO Air Fuel Ratio Sensor (part 234 5719) is a precision upstream sensor designed for Volkswagen fuel management systems. It delivers accurate data to the engine control module for optimal performance and reduced emissions. Built to meet or exceed OEM specifications, it ensures reliable operation and improved fuel efficiency. Key Features & Benefits OEM Quality: Meets or exceeds original equipment specifications for perfect fit and function.