This 4-wire narrow-band oxygen sensor fits 1993-1995 BMW 525i and 1993 BMW 525iT with the 2.5L I6 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 350-34624 Oxygen Sensor Features:

• Fits 1993-1995 BMW 525i; 1993 BMW 525iT with the 2.5L I6 engine
• 4-wire narrow-band oxygen sensor
• Built-in heater for fast warm-up
• M18x1.5 threaded mounting with a 22 mm hex, 1425 mm (56.1 in.) overall length
• Female circle connector at the harness end
• Platinum electrode layer with a protective coating against combustion residue