Details

• Brand:

  

  

• SKU:

  JR3Z-9G444-A

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

  Rear Oxygen Sensor, Sensor Exhaust Gas Oxygen, dy1438

• Description:

  This genuine Ford downstream heated exhaust gas oxygen (HEGO) sensor is the passenger-side post-catalyst sensor for the 2018-2023 Mustang 5.0L with automatic transmission, threading into the exhaust after the catalytic converter to monitor catalyst efficiency and provide the feedback the powertrain control module uses to verify emissions performance. Cataloged by Ford as Sensor - Exhaust Gas Oxygen, it reports the oxygen content of post-catalyst exhaust so the engine controller can confirm the converter is doing its job. A failing downstream sensor commonly triggers a check engine light with catalyst-efficiency codes such as P0420, causes fluctuating fuel trims, or produces a lazy or biased signal as the sensor element ages, becomes contaminated, or the internal heater circuit fails. Route the harness away from hot exhaust and moving components, avoid getting silicone sealer or other contaminants on the sensor tip, and apply only a Motorcraft-approved anti-seize compound to the threads if the fastener is not already pre-coated. Allow the exhaust to cool before removal to protect the threads in the exhaust bung, and confirm the electrical connector locks fully so the signal and heater circuits stay intact. The companion JR3Z-9G444-B serves the opposite bank downstream position, so verify bank and position against the vehicle before fitting.

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