This 3-wire narrow-band oxygen sensor fits 1983-1988 Porsche 944 and 1987-1988 Porsche 924 with the 2.5L I4 engine in the upstream position and 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 350-33031 Oxygen Sensor Features:

• Fits 1983-1988 Porsche 944; 1987-1988 Porsche 924 with the 2.5L I4 engine
• Sensor location by application: B1S1 (bank and sensor number)
• For California emissions vehicles
• 3-wire narrow-band oxygen sensor
• Built-in heater for fast warm-up
• M18x1.5 threaded mounting with a 22 mm hex, 925 mm (36.4 in.) overall length
• Male female circle connector at the harness end
• Platinum electrode layer with a protective coating against combustion residue