The 4-wire narrow-band oxygen sensor is a replacement sensor for 2017-2018 Audi A1 and 2016-2019 Seat Toledo with the 1.4L I4 engine in the upstream position. 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 350-341048 Oxygen Sensor Features:

• Fits 2017-2018 Audi A1; 2016-2019 Seat Toledo with the 1.4L I4 engine
• 4-wire narrow-band oxygen sensor
• Built-in heater for fast warm-up
• M18x1.5 threaded mounting with a 22 mm hex
• Female oblong connector at the harness end with 4 spade terminals
• Platinum electrode layer with a protective coating against combustion residue