NTK 25721 rear oxygen sensor for the 2004-2010 Toyota Highlander V6 3.3L, the 2008-2016 Highlander V6 3.5L and other vehicles sends closed-loop feedback to the ECU. This NTK oxygen sensor also lets the OBDII system flag problems with fuel delivery or catalytic converter efficiency.
- Switching zirconia sensing element with a heated design
- 3-stage contaminant-resistant plasma jet and deposit trap overcoat protects the ceramic element against poisoning
- Dual-coated platinum interface and thinner ceramic element for quick light-off and response
- Water-resistant connector and harness accessory hardware for installation
- Vibration and thermal shock testing during development
Quick facts
- Part: NTK 25721 oxygen sensor
- Fits: the 2004-2010 Toyota Highlander V6 3.3L, the 2008-2016 Highlander V6 3.5L and other vehicles
- Position: Downstream rear
- Condition: New
A check-engine light with an oxygen sensor or catalyst code, or a drop in fuel economy, can mean the sensor is worn. Before you replace it, rule out an exhaust leak near the sensor and a damaged connector or wiring, since those can set off similar codes.
Fits
The 2004-2010 Toyota Highlander V6 3.3L, the 2008-2016 Highlander V6 3.5L, the 2007-2015 Lexus RX350 V6 3.5L and the 2010-2015 Lexus RX450h V6 3.5L all take this sensor, as do other vehicles. If your car is not named here, open the "Vehicles it fits" section to check your exact model and engine.
Specifications
Fit and size
- Position: downstream rear
- Quantity per vehicle: 1
- Hex size: 7/8" (22mm)
Build and materials
- Technology: switching zirconia type
- Heated: yes
- Condition: new
In the box
One oxygen sensor with its water-resistant connector and harness accessory hardware. This listing holds one sensor, and the downstream rear position takes one on these vehicles.
Frequently Asked Questions
Does this Toyota Highlander oxygen sensor fit the 2004-2010 V6 3.3L and the 2008-2016 V6 3.5L?
Yes, NTK 25721 fits the 2004-2010 Toyota Highlander V6 3.3L and the 2008-2016 Highlander V6 3.5L as the downstream rear sensor; open the "Vehicles it fits" section to check other models.
Does the NTK 25721 come with its connector hardware?
Yes, the NTK 25721 comes with a water-resistant connector and harness accessory hardware, and this listing is one sensor.
Is this NTK O2 sensor heated?
Yes. The NTK 25721 is a heated, switching zirconia sensor with a 7/8" (22mm) hex.
How are NTK sensors tested during development?
Development of NTK oxygen sensors includes vibration and thermal shock testing, and the sensors are also tested during manufacturing.
What protects the sensing element on the NTK 25721 from contamination?
A 3-stage contaminant-resistant plasma jet and deposit trap overcoat on the ceramic element protects it against element poisoning.
