A-Premium Downstream O2 Oxygen Sensor for Ford & Lincoln — Heated 4-Wire, 750mm Single

A-Premium Downstream O2 Oxygen Sensor is a direct-fit, heated downstream oxygen sensor engineered to restore accurate exhaust oxygen readings on compatible Ford and Lincoln models.

This replacement downstream (post-catalyst) oxygen sensor from A-Premium is built to match OE form and function for a range of Ford and Lincoln vehicles. It uses a heated element and a four-wire connector to provide fast warm-up and reliable signal reporting to the vehicle’s engine control module (ECM). The sensor is threaded for straightforward installation and comes boxed with a 750 mm lead length to reach common downstream mounting locations.

Which vehicles will this A-Premium downstream sensor fit?

The sensor fits many Ford and Lincoln models that use a downstream (bank 1, sensor 2 or bank 2, sensor 2) configuration. Check the exact model years, engine sizes and VIN notes below to confirm compatibility before ordering.

• Ford Bronco Sport 2021–2022 L4 2.0L (B1S2)
• Ford Edge 2016–2022 L4 2.0L (B1S2, from 02/27/2016) and Escape 2017–2022 L4 2.0L
• Ford Explorer 2016–2023 L4 2.3L (B1S2) and Focus/Fusion variants listed in compatibility
• Lincoln Corsair, MKC, MKZ, Nautilus and selected Taurus/MKT/E-Series fitments as specified

What are the technical specifications of this oxygen sensor?

The A-Premium sensor is a heated, threaded oxygen sensor with a four-wire female connector and a 750 mm overall cable length. It is packaged singly in a protective box and carries several cross-reference numbers used by parts professionals.

• Sensor type: Heated downstream oxygen sensor (post-catalyst)
• Wiring: 4 wires with female connector for OEM-style hookups
• Mounting: Threaded body for standard oxygen sensor ports
• Length and packaging: 750 mm overall cable; sold as 1x oxygen sensor in a box
• Reference numbers: 250-241184, 234-8039, FB5Z9G444A, GK4Z9G444E, HS7Z9G444A

How does this downstream oxygen sensor affect vehicle operation?

The downstream sensor monitors exhaust oxygen levels after the catalytic converter and helps the vehicle’s control systems evaluate catalyst efficiency and emissions. While it does not directly control fuel trim the way an upstream sensor does, accurate downstream readings are important for emission diagnostics and for preventing diagnostic trouble codes (DTCs).

• Helps the ECM monitor catalytic converter performance
• Reduces false emission-related fault codes with a proper replacement
• Heated element enables quicker sensor readiness after cold starts
• Four-wire design supports OEM-style grounding and heater circuits

What should I know about installation and fit verification?

Installation is typically straightforward for anyone comfortable working under the vehicle and using basic hand tools. Always compare the sensor’s connector, thread size and cable length to the original part and consult the vehicle compatibility list or a VIN lookup to ensure proper fit.

• Threaded mount accepts standard O2 sensor sockets and crowfoot tools
• 750 mm lead length suits most downstream mounting positions without stretching
• Confirm match with original part numbers or the reference numbers provided
• Disconnect the battery and follow safety precautions when replacing sensors

Who is this for: This A-Premium downstream oxygen sensor is intended for DIY mechanics, independent repair shops and fleet technicians who need a cost-effective replacement for downstream oxygen sensor faults, emission testing preparations or routine exhaust system repairs on compatible Ford and Lincoln vehicles. Verify vehicle year, engine and sensor position before purchasing to ensure a correct fit.