Replacing Air-Fuel Ratio Sensor In 2008 Highlander: Step-By-Step Guide

Replacing the air-fuel ratio sensor in a 2008 Toyota Highlander can be a challenging task, especially for those who are not mechanically inclined. The sensor is located in the engine bay, and accessing it may require removing some parts. It is recommended to use a torque wrench and an oxygen sensor wrench for this job. Before attempting to remove the sensor, it is important to unplug the electrical connector. Additionally, applying some heat to the exhaust pipe around the sensor can help loosen it. When installing the new sensor, it is crucial to torque it properly, and using a torque wrench can help ensure this. It is also important to note that there are two types of sensors: upstream and downstream. The upstream sensor is located before the catalytic converter, while the downstream sensor is located after it. When purchasing a replacement sensor, it is essential to get the correct type for your vehicle.

The air fuel ratio sensor is located on the exhaust manifold

To replace the air fuel ratio sensor, you will need to raise the vehicle and unplug the electrical connector. You can then use a socket wrench to unscrew the sensor from the exhaust pipe. The sensor is located before the catalytic converter.

There are four oxygen sensors on this vehicle, two air fuel ratio sensors and two oxygen sensors. The oxygen sensors are after the catalytic converter. The air fuel ratio sensor is an OEM-style, direct-fit sensor.

The sensor can be replaced using a socket wrench and an adapter

The air fuel ratio sensor in a 2008 Highlander can be replaced using a socket wrench and an adapter. The sensor is located on the exhaust manifold, which can be accessed by opening the hood and looking straight down through a hole in the manifold heat shield. The socket wrench and adapter can then be used to remove the sensor by unscrewing it from the exhaust pipe.

It is recommended to use a MAPP torch to heat up the exhaust pipe around the sensor before attempting to loosen it, as this can make it easier to unscrew. An oxygen sensor wrench is also a useful tool that can be rented from most local big-chain stores and used to unscrew the sensor from the exhaust pipe.

When replacing the sensor, it is important to note that there are two different types of sensors: upstream and downstream. The upstream sensor is located before the catalytic converter, while the downstream sensor is located after it. This distinction is important when purchasing a replacement sensor to ensure the correct part is obtained.

Additionally, it is recommended to use a torque wrench for added leverage when removing the sensor, and to apply penetrating oil, such as PB Blaster, to encourage the removal of the sensor if it is difficult to unscrew.

The sensor is an OEM-style Denso direct-fit air fuel ratio sensor

The Denso Direct-Fit Air Fuel Ratio Sensor is a precision-engineered component manufactured to meet OE standards. It is designed to be an exact replacement for your 2008 Highlander, ensuring a perfect fit the first time.

The sensor measures the air-fuel ratio under a wide range of driving conditions, sending this information to the engine management computer to make adjustments. This helps to control the engine, optimising fuel efficiency and reducing emissions.

The sensor features a quick-response planar zirconia element, which can quickly detect oxygen concentration. It also has tarnish-proof platinum electrodes, which extend the life of the sensor and maintain accuracy.

The Denso Direct-Fit Air Fuel Ratio Sensor is constructed from corrosion-resistant stainless steel and features a PTFE filter, which blocks contaminants. It is a direct replacement for your 2008 Highlander, with a 7/8-inch hex size and an 11-15/16-inch overall length.

The sensor is located under the vehicle, mounted to the exhaust pipe before the converter

To replace the air-fuel ratio sensor on a 2008 Highlander, you will need to locate the sensor under the vehicle. It is mounted to the exhaust pipe before the converter.

First, raise the vehicle. Then, unplug the electrical connector from the sensor. You may need to use an oxygen sensor wrench to unscrew the sensor from the exhaust pipe. Reverse the procedure to install the new sensor.

The air-fuel ratio sensor is an OEM-style, direct-fit sensor. It is located before the catalytic converter. The sensor is wideband and should be replaced with a direct-fit, wideband sensor.

The sensor is accessible from the underside of the vehicle

To replace the air fuel ratio sensor on a 2008 Toyota Highlander, you will need to access the underside of the vehicle. The sensor is located on the exhaust manifold, facing the bumper.

First, raise the vehicle and locate the sensor. You will need to remove the heat shield to access the sensor. Using a socket wrench and possibly an adapter, unplug the electrical connector and unscrew the sensor from the exhaust pipe. You may need to use a MAPP torch to carefully heat the exhaust pipe around the sensor to loosen it. The sensor should then break free fairly easily.

When installing the new sensor, reverse the removal process. Tighten the sensor to the specified torque rating and lower the vehicle.

It is recommended to use a Denso sensor as it is the Original Equipment Manufacturer (OEM) for this vehicle. The part number for the sensor is 89467-48130, which has been replaced by part number 89467-OE040.

Frequently asked questions