Details

• Brand:

  

  

• SKU:

  F1FZ-9G444-A

• Positions: Rear Lower, Rear
• Other Names:

  Rear Oxygen Sensor, Sensor Exhaust Gas Oxygen, dy1310

• Description:

  This genuine Ford heated oxygen sensor is the front upstream air/fuel ratio sensor that mounts ahead of the catalytic converter and reports exhaust oxygen content to the powertrain control module so it can trim fuel delivery for the correct air/fuel ratio. It fits 2015-2018 Ford Focus and carries Ford engineering number F1FZ-9G444-A, cataloged as an Exhaust Gas Oxygen Sensor. The upstream sensor is the primary feedback device for closed-loop fuel control, and as it ages the ceramic element slows down or becomes contaminated by oil, coolant, or silicone, which degrades its response. Symptoms of a failing sensor include a check engine light with codes such as P0131 through P0135 or lean and rich fuel-trim faults, rough idle, hesitation, reduced fuel economy, and failed emissions testing. Because the sensor is heated for faster light-off, an open heater circuit will also set a code and delay closed-loop operation on cold starts. Installing a genuine Ford sensor restores accurate oxygen readings and the correct connector and heater calibration the vehicle expects, avoiding the driveability and trim problems that come with an imprecise substitute. Apply a light coat of anti-seize to the threads only if they are not already coated, torque to specification, and route the harness away from the exhaust to prevent heat damage. This is the correct OEM replacement to return the engine to proper closed-loop fuel control and clean emissions.

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