Details

• Brand:

  

  

• SKU:

  DY-1289

• Positions: Rear, Left Rear, Right Rear
• Other Names:

  Motorcraft™ Oxygen Sensor, Sensor Exhaust Gas Oxygen

• Description:

  This is a genuine Motorcraft rear, downstream heated exhaust gas oxygen (HEGO) sensor that installs after the catalytic converter and measures the oxygen content of the post-catalyst exhaust so the powertrain control module can monitor catalyst efficiency and verify that the emission system is working. As the downstream catalyst-monitor sensor it does not drive primary fueling like a front sensor; instead it confirms the converter is cleaning the exhaust and helps detect a degraded catalyst. It fits the 2015-2017 Ford Expedition and Lincoln Navigator in the rear sensor position. The Motorcraft catalog name is Oxygen Sensor, listed in the rear location. A failing downstream sensor typically sets catalyst-monitor and oxygen-sensor codes in the P0136, P0137, P0140, or P0141 range, illuminates the check-engine lamp, can flag a false catalyst-efficiency fault, and may cause emissions-test failure and modest fuel-economy loss. The unit ships with the correct sealed connector and heater circuit matched to the harness for a direct fit. Apply anti-seize to the threads only, keep silicone, grease, and cleaners off the sensing tip, and torque to the exhaust-bung specification so the ceramic element is not damaged. Because it is built to the original heater resistance and switching characteristics, the module reads it without adaptation, making replacement a clean restoration of catalyst monitoring. Fitting this genuine Motorcraft rear sensor restores accurate post-catalyst feedback and proper emission-system self-checks on the 2015-2017 Expedition and Navigator it was cataloged to serve, clearing the downstream oxygen-sensor and catalyst-monitor codes caused by a slow, biased, or contaminated original sensor.

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