The oxygen sensor installs in the upstream position on 2004 Volkswagen Sedan with the 1.6L H4 engine. 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 250-24719 Oxygen Sensor Features:

• Fits 2004 Volkswagen Sedan with the 1.6L H4 engine
• 4-wire narrow-band oxygen sensor
• Built-in heater for fast warm-up
• M18x1.5 threaded mounting
• Female oblong connector at the harness end with 4 spade terminals
• Platinum electrode layer with a protective coating against combustion residue