The oxygen sensor installs in the upstream position on 1990-1992 Ferrari 348 TB, 1990-1993 Ferrari Mondial t and 1993-1994 Ferrari 348 GTB with the 3.4L V8 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 350-34325 Oxygen Sensor Features:

• Fits 1990-1992 Ferrari 348 TB; 1990-1993 Ferrari Mondial t; 1993-1994 Ferrari 348 GTB with the 3.4L V8 engine
• 4-wire narrow-band oxygen sensor
• Built-in heater for fast warm-up
• M18x1.5 threaded mounting with a 22 mm hex, 915 mm (36 in.) overall length
• Female rectangle connector at the harness end
• Platinum electrode layer with a protective coating against combustion residue