O2 Oxygen Sensor Downstream for Toyota Highlander (2011-2016) 3.5L

Direct-Fit Downstream Oxygen Sensor for 2011-2016 Toyota Highlander (XU40 / XU50)

What it Does: The downstream oxygen sensor monitors post-catalytic converter exhaust gas composition on the 2011-2016 Toyota Highlander to ensure proper emissions compliance and prevent catalyst efficiency check engine lights.

The Stock Toyota Highlander Sensor Degradation

Over extended heat cycles, the factory downstream O2 sensors on the Toyota Highlander succumb to carbon contamination, silicone poisoning, and internal heater circuit failure. As the internal ceramic sensing element degrades on the high-mileage 2GR-FE engine, voltage response slows significantly. This signal latency leads to false-positive diagnostic trouble codes (such as P0420 or P0430), failed state emissions inspections, and skewed short-term fuel trim calibration.

The Engineering Solution

Engineered to match OEM switching rates, this direct-fit sensor features a robust planar zirconia ceramic element protected by a 304 stainless steel double-layered thermal shield. Built with factory-pinned weather-pack terminal connectors, high-temp PTFE insulated wiring, and corrosion-resistant outer housing, it provides precise millivolt feedback to the engine control module. The direct-fit design eliminates wire cutting or splicing, restoring clean closed-loop signal integrity and eliminating emission-related error codes.

What's Included

• 1x Downstream Direct-Fit Oxygen Sensor

Technical Specifications

Compatibility

• 2011-2013 Toyota Highlander Base / SE / Limited (3.5L V6 Gas)
• 2014-2016 Toyota Highlander LE / LE Plus / XLE / Limited (3.5L V6 Gas)

Frequently Asked Questions & Fitment Warnings

Does this fit the XU40 / XU50 Highlander?

Yes, this is a direct fit for the downstream position on the 2011-2016 Toyota Highlander equipped with the 3.5L 2GR-FE V6 engine. Does not fit 2.7L 1AR-FE 4-cylinder or Hybrid models.

Is wire splicing required during installation?

No, this sensor features an exact OEM-spec harness connector and lead length for complete plug-and-play installation.

The Toyota Durability Standard

Built to handle the harsh thermal underbody conditions of the XU40 and XU50 platforms, this downstream sensor delivers accurate catalytic monitoring and long-term emissions stability.