A dying oxygen sensor deserve to trick your engine into giving it more fuel when it doesn"t require it, or less fuel once it does.


This article applies to the Lexus RX (2007-2014).

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The oxygen sensor actions the lot of oxygen existing in the exhaust. The data read from this sensor help the motor readjust the fuel intake to maximize power by providing the ideal ratio the oxygen to fuel. If the sensor malfunctions and reads the oxygen level as too high, the computer will compensate by dumping in more fuel which leads to wasted gas. Vice versa, if it reads also low the computer system will lower the amount of fuel which deserve to lead to power loss and possibly misfire.

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Materials Needed7/8" wrench, oxygen sensor socket or spark plug socketFlat head screwdriverFloor jackJack stands

There are two set of oxygen sensors on the Lexus RX. This article will covering removing the 2 sensors that are located simply past the catalytic converters. The other two are located on the exhaust manifolds before the catalytic converter. The one nearest come the radiator can be conveniently accessed through an oxygen sensor socket and a wrench. The various other is situated on the rear exhaust manifold. The easiest way to eliminate a bank is by removed the exhaust manifold and also the sensor in addition to it.

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Figure 1. Bank Sensor locations.

Step 1 - Preparation

Depending on i beg your pardon sensors room failing, you may or might not must put the automobile on jack stands. Park the car on flat, level ground. Block the behind wheels. Disconnect the an unfavorable battery cable. Jack increase the former of the car and place it onto jack stands.

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Figure 2. Jack under car.

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Step 2 - remove the sensor

You"ll require to find the sensor you"re replacing first. Bank 2 Sensor 1 will be close to the manifold available through the engine only (Figure 3). Financial institution 1 Sensor 1 is behind the engine prior to the main catalytic converter (Figure 4). The two other sensors are located after the catalytic converters.

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Figure 3. Bank 2 Sensor 1.
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Figure 4. Financial institution 1 Sensor 1.

Follow the wires ~ above the sensor you"re removing to the cable harness clip. Utilizing a flat head screwdriver, pry increase the clip tab and unplug the (Figure 5). Following the wires back, over there are tiny clips that save the wires from hitting the exhaust. Just wiggle these and also they"ll come totally free pretty easily. Now, remove the old sensor through unscrewing it with the 7/8" wrench or the socket.

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Figure 5. Wire harness clip.

Removing the sensors can be complicated depending ~ above the lot of rust that"s created on the subject of these sensors. Apply a generosity amount the PB Blaster or something comparable to the threading, and allow it come sit because that a couple of hours. If friend can"t manage to acquire the wrench in place and don"t have a slotted socket to permit the wires to pass through, friend can cut the old wires appropriate at the sensor and use a common deep socket on it.

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Step 3 - Install brand-new sensor

Apply anti-seize come the threading ~ above the sensor, taking special care not come get any kind of on the yes, really sensor itself. Hand tighten the sensor in place and then tighten it fully using the wrench or tool. Plug the electrical connection into the wire harness friend unplugged the old one from. Re-install any kind of wire clips into the places you eliminated them from. You deserve to now reconnect the an adverse battery cable, reattach the plastic trim, and take the automobile off of the jack stands.