Details

• Brand:

  

  

• SKU:

  JL3Z-9G444-B

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

  Lower Oxygen Sensor, Sensor Exhaust Gas Oxygen, dy1419

• Description:

  This is the Genuine Ford HEGO oxygen sensor used in F-150 applications carrying the JL3Z-9G444-B service number. It is one of the post-catalyst downstream oxygen sensors that the PCM uses to evaluate catalyst efficiency and to provide secondary fuel trim correction on the F-150 V6 and V8 engine family. The sensor is calibrated to the specific exhaust pulse, harness length, and connector that the truck uses for the downstream position, and the OEM construction provides the response time and signal integrity required for catalyst efficiency monitoring. A failing downstream sensor typically shows as P0420 or P0430 catalyst efficiency codes that cannot be cleared by other means, and as drift in long-term fuel trims. This is the correct OEM service sensor for this downstream position. Install with the exhaust cool, anti-seize on the threads where Ford specifies, the published torque value applied with the correct torque tool, and the connector seated fully into the body harness. Clear fault codes, run the published Ford readiness drive cycle, and verify the catalyst monitor completes without recurring fault.

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