O2 Oxygen Sensor Upstream Downstream for Ford Taurus (2016-2019) 3.5L

Direct-Fit O2 Sensor Kit for 2016-2019 Ford Taurus (D3)

What it Does: This 4-piece oxygen (O2) sensor kit monitors pre- and post-catalyst exhaust gas on the 2016-2019 Ford Taurus (D3) 3.5L Duratec and 3.5L EcoBoost to maintain closed-loop fuel control.

The Stock Ford Taurus O2 Sensor Failure

On the D3 Taurus powered by the 3.5L Duratec or 3.5L EcoBoost, factory O2 sensors endure extreme exhaust heat and carbon soot. Over time, internal zirconia elements foul or micro-fracture, causing sluggish air-fuel voltage switching. Simultaneously, internal heater circuits degrade from vibration and heat soak. These failures trigger P0135, P0155, and P0420/P0430 codes while forcing rich open-loop fueling.

Common Symptoms of a Failing OEM Oxygen Sensor

• Check Engine Light (DTCs): Triggers heater circuit codes P0135/P0155 or catalyst codes P0420/P0430 from sluggish switching.
• Excessive Fuel Consumption: Biased upstream feedback forces rich open-loop trims and foul exhaust soot.
• Rough Idle & Failed Emissions: Unstable fuel trims cause hesitation and incomplete OBD-II readiness.

The Direct-Fit Matched O2 Sensor Solution

Replacing all four sensors together restores uniform closed-loop response across both banks on your D3 Taurus. Each sensor features a laser-welded stainless housing and thermal-shock-resistant ceramic element sealed against exhaust moisture. Calibrated to OEM resistance curves, this kit replaces 234-5175, 234-5176, and 234-4966. Pre-terminated OEM-style connectors and exact harness lengths ensure true plug-and-play bung installation.

What's Included

• 2 Upstream Oxygen Sensors
• 2 Downstream Oxygen Sensors

Technical Specifications

Compatibility

• 2016-2019 Ford Taurus 3.5L Naturally Aspirated (2 Upstream, 2 Downstream)
• 2016-2019 Ford Taurus 3.5L EcoBoost (2 Upstream, 2 Downstream)

Frequently Asked Questions & Fitment Warnings

Does this fit the D3 Taurus?

Yes. Fits 2016-2019 Ford Taurus models with the 3.5L Duratec or 3.5L EcoBoost engine. Excludes 2013-2015 Taurus, 2.0L engines, and other Ford/Lincoln 3.5L/3.7L models.

Will this clear P0135 or P0420 codes?

Yes, if sensor-induced. Restores heater resistance and cross-count switching to clear P0135, P0155, and false P0420/P0430 codes.

Is wiring modification or splicing required?

No. Includes OEM connectors and factory harness lengths for plug-and-play installation with O2-safe thread anti-seize.

The Ford Precision Standard

Built for the ECU precision of the D3 platform, this matched sensor kit restores crisp fueling and CEL-free operation on your 2016-2019 Ford Taurus.