Denso 234-4966 Oxygen Sensor - Downstream
OE Quality 60-Day Returns
Denso
 OE Style

Denso 234-4966 Oxygen Sensor - Downstream

Brand Denso 234-4966
Position Downstream
Wiring Harness Length 17.56
Sensor Type Heated
Universal Or Specific Fit Specific
Wire Quantity 4
Product line OE Style
Fits Ford and Lincoln · 65 vehicles

OE style replacement. Precision built for exact replacement and a first-time fit.

Heated sensor. Helps the engine run efficiently with faster operating response.

Aluminum oxide trap layer. Protects the ceramic element from contamination for longer service life.

Cross-references Ford FL3Z9G444A, Ford FL3Z9G444E and Ford GK4Z9G444A for the same application. See all 10.

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Denso OE Style Downstream Oxygen Sensor

Denso 234-4966 is an OE Style heated downstream oxygen sensor built for specific-fit replacement on select Ford and Lincoln applications. It is engineered for exact fitment and stable signal performance, with a design focused on restoring proper exhaust monitoring and drivability.

Key Features

  • Heated oxygen sensor with a 4-wire design
  • Specific-fit replacement for direct installation on listed vehicles
  • 17.56 in. wiring harness length for application-specific routing
  • OE Style construction for factory-style fit and function
  • Aluminum oxide trap layer helps protect the sensing element from silicone and lead contamination
  • Built and tested to OE standards for consistent replacement performance

Product Details

Denso OE Style sensors are precision built to match the original part’s dimensions and electrical characteristics. Part number 234-4966 is a downstream oxygen sensor for vehicles such as the Ford Explorer, Ford Edge, Ford Mustang, Lincoln MKX, and Lincoln Continental, helping maintain accurate exhaust feedback after the catalytic converter. This part cross-references Ford OE numbers FL3Z9G444A and GK4Z9G444A for the same application.

Compatible With 2017-2020 Lincoln Continental, downstream; 2020 Lincoln MKZ, downstream; 2016-2019 Ford Explorer, downstream; 2016-2019 Ford Flex, downstream; 2019 Ford Fusion, downstream; 2017 Ford Fusion, downstream; 2016-2019 Ford Taurus, downstream; 2016-2019 Ford Transit-150, downstream; 2016-2019 Ford Transit-250, downstream; 2016-2019 Ford Transit-350, downstream; 2016-2019 Ford Transit-350 HD, downstream; 2019 Lincoln MKT, downstream; 2017-2019 Lincoln MKZ, downstream; 2016-2018 Ford E-350 Super Duty, downstream; 2015-2018 Ford Edge, downstream; 2018 Ford Fusion, downstream; 2015-2018 Ford Mustang, downstream; 2017-2018 Lincoln MKT, downstream; 2016-2018 Lincoln MKX, downstream; 2016 Lincoln MKS, downstream; 2016 Lincoln MKT, downstream.

Common Issues This Sensor Can Address

  • Check engine light related to downstream oxygen sensor performance
  • Incorrect exhaust feedback after catalytic converter service
  • Rough idle or drivability concerns tied to faulty sensor input
  • Reduced fuel economy caused by inaccurate air-fuel monitoring
  • Emissions test failures linked to sensor degradation

Installation Notes and Tips

Verify the connector style, harness length, and downstream location before installation. This is a specific-fit sensor, so match the vehicle year, make, model, and position exactly to the listed applications. Inspect the exhaust threads and wiring path during replacement to avoid damage to the sensor lead.

Quality Assurance

Denso manufactures and tests this OE Style oxygen sensor to strict original-equipment standards. The design includes an aluminum oxide trap layer to help protect the ceramic sensing element from contamination, supporting long-term performance in demanding exhaust conditions.

Related reading

This part fits 65 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelSubmodelTransmissionFuel TypePositionNotes
2020LincolnContinental———DownstreamOE Style
2020LincolnMKZ———DownstreamO.E. Quality Direct Fit Replacement Sensor; Oxygen Sensor - OE Style
2019FordExplorer———DownstreamOE Style
2019FordFlex———DownstreamOE Style
2019FordFusion———DownstreamOE Style
2019FordTaurus———DownstreamOE Style
2019FordTransit-150———DownstreamOE Style
2019FordTransit-250———DownstreamOE Style
2019FordTransit-350———DownstreamOE Style
2019FordTransit-350 HD———DownstreamOE Style
2019LincolnContinental———DownstreamOE Style
2019LincolnMKT———DownstreamOE Style
2019LincolnMKZ———DownstreamOE Style
2018FordE-350 Super Duty——GASDownstreamOE Style
2018FordE-350 Super Duty——CNGDownstreamOE Style
2018FordEdgeTitanium——DownstreamOE Style
2018FordEdgeSEL——DownstreamOE Style
2018FordEdge———DownstreamOE Style
2018FordExplorer———DownstreamOE Style
2018FordFlex———DownstreamOE Style
2018FordFusion———DownstreamO.E. Quality Direct Fit Replacement Sensor; Oxygen Sensor - OE Style
2018FordMustang—Manual—DownstreamOE Style
2018FordTaurus———DownstreamOE Style
2018FordTransit-150———DownstreamOE Style
2018FordTransit-250———DownstreamOE Style
2018FordTransit-350———DownstreamOE Style
2018FordTransit-350 HD———DownstreamOE Style
2018LincolnContinentalLivery——DownstreamOE Style
2018LincolnContinentalReserve——DownstreamOE Style
2018LincolnContinental———DownstreamOE Style
2018LincolnMKT———DownstreamO.E. Quality Direct Fit Replacement Sensor; Oxygen Sensor - OE Style
2018LincolnMKX———DownstreamOE Style
2018LincolnMKZ———DownstreamOE Style
2017FordE-350 Super Duty——GASDownstreamOE Style
2017FordE-350 Super Duty——CNGDownstreamOE Style
2017FordEdge———DownstreamOE Style
2017FordExplorer———DownstreamOE Style
2017FordFlex———DownstreamOE Style
2017FordFusion———DownstreamOE Style
2017FordMustang—Manual—DownstreamOE Style
2017FordTaurus———DownstreamOE Style
2017FordTransit-150———DownstreamOE Style
2017FordTransit-250———DownstreamOE Style
2017FordTransit-350———DownstreamOE Style
2017FordTransit-350 HD———DownstreamOE Style
2017LincolnContinental———DownstreamOE Style
2017LincolnMKT———DownstreamO.E. Quality Direct Fit Replacement Sensor; Oxygen Sensor - OE Style
2017LincolnMKX———DownstreamOE Style
2017LincolnMKZ———DownstreamOE Style
2016FordE-350 Super Duty——GASDownstreamOE Style
2016FordE-350 Super Duty——CNGDownstreamOE Style
2016FordEdge———DownstreamOE Style
2016FordExplorer———DownstreamOE Style
2016FordFlex———DownstreamOE Style
2016FordMustang—Manual—DownstreamOE Style
2016FordTaurus———DownstreamOE Style
2016FordTransit-150———DownstreamOE Style
2016FordTransit-250———DownstreamOE Style
2016FordTransit-350———DownstreamOE Style
2016FordTransit-350 HD———DownstreamOE Style
2016LincolnMKS———DownstreamFrom 12/07/2015; OE Style
2016LincolnMKT———DownstreamMid Version; OE Style
2016LincolnMKX———DownstreamOE Style
2015FordEdge———DownstreamOE Style
2015FordMustang—Manual—DownstreamOE Style
Directly replaces or cross-references 10 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Ford — FL3Z9G444AFord — FL3Z9G444EFord — GK4Z9G444AFord — GK4Z9G444BNTK — 22052NTK — 22066Walker Products — 250-241185Walker Products — 250-241206Walker Products — 350-341008Walker Products — 350-341014