The 4-wire narrow-band oxygen sensor is a replacement sensor for select 2014-2026 Audi, Porsche and Volkswagen applications. It signals whether the exhaust is running rich or lean so the engine computer can trim fuel delivery. A built-in heater brings the element to operating temperature quickly after a cold start.

Walker Products 250-241089 Oxygen Sensor Features:

• Fits 2015-2018 Audi A8 Quattro; 2016 Audi A1, A6; 2016-2018 Audi A6, A7 Quattro; 2017-2019 Audi Q7; 2020-2026 Porsche 911; 2014-2017 Volkswagen Vento
• Engine coverage includes 1.4L I4, 1.6L I4, 3.0L V6, 3.0L H6 applications
• Sensor locations by application: B1S2, B2S2 (bank and sensor number)
• Used in both upstream and downstream positions, depending on application
• 4-wire narrow-band oxygen sensor
• Built-in heater for fast warm-up
• M18x1.5 threaded mounting with a 22 mm hex, 350 mm (13.8 in.) overall length
• Male/female rectangle connector at the harness end with 4 spade terminals
• Platinum electrode layer with a protective coating against combustion residue