The 4-wire narrow-band oxygen sensor is a replacement sensor for 2016-2019 Ford Transit-150, Transit-250, Transit-350 and Transit-350 HD with the 3.7L V6 engine in the downstream position. It signals whether the exhaust is running rich or lean so the engine computer can trim fuel delivery. It uses a female circle connector with 4 terminals.

Walker Products 350-341008 Oxygen Sensor Features:

• Fits 2016-2019 Ford Transit-150, Transit-250, Transit-350, Transit-350 HD with the 3.7L V6 engine
• Sensor location by application: B2S2 (bank and sensor number)
• 4-wire narrow-band oxygen sensor
• Built-in heater for fast warm-up
• M18x1.5 threaded mounting with a 22 mm hex, 275 mm (10.8 in.) overall length
• Female circle connector at the harness end with 4 spade terminals
• Platinum electrode layer with a protective coating against combustion residue