The oxygen sensor installs in the upstream position on 2013-2015 Seat Toledo and 2003-2006 Volkswagen Polo. 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 350-34960 Oxygen Sensor Features:

• Fits 2013-2015 Seat Toledo; 2003-2006 Volkswagen Polo
• Engine coverage includes 1.2L I4, 1.6L I4 applications
• Sensor location by application: B1S1 (bank and sensor number)
• 4-wire narrow-band oxygen sensor
• Built-in heater for fast warm-up
• M18x1.5 threaded mounting with a 22 mm hex, 500 mm (19.7 in.) overall length
• Female oblong connector at the harness end with 4 spade terminals
• Platinum electrode layer with a protective coating against combustion residue