The oxygen sensor installs in the upstream position on 1989-1992 Volvo 740 with the 2.3L I4 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 350-33015 Oxygen Sensor Features:

• Fits 1989-1992 Volvo 740 with the 2.3L I4 engine
• Sensor location by application: B1S1 (bank and sensor number)
• 3-wire narrow-band oxygen sensor
• Titania sensing element
• Built-in heater for fast warm-up
• M18x1.5 threaded mounting with a 22 mm hex, 1720 mm (67.7 in.) overall length
• Male rectangle connector at the harness end with 2 spade terminals
• Platinum electrode layer with a protective coating against combustion residue