A dying oxygen sensor deserve to trick her engine into offering it an ext fuel as soon as it doesn"t need it, or much less fuel when it does.

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

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The oxygen sensor actions the quantity of oxygen existing in the exhaust. The data check out from this sensor help the motor adjust the fuel intake to maximize power by offering the appropriate ratio the oxygen come fuel. If the sensor malfunctions and also reads the oxygen level as as well high, the computer will compensate through dumping in much more fuel which leads to wasted gas. Conversely, if it reads also low the computer will reduced the amount of fuel which deserve to lead to power loss and possibly misfire.


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

There space two sets of oxygen sensors ~ above the Lexus RX. This post will sheathe removing the two sensors that are located just past the catalytic converters. The other two are situated on the exhaust manifolds prior to the catalytic converter. The one nearest to the radiator can be quickly accessed with an oxygen sensor socket and a wrench. The various other is located on the rear exhaust manifold. The easiest method to eliminate a bank is by removing the exhaust manifold and the sensor in addition to it.

Figure 1. Bank Sensor locations.

Step 1 - Preparation

Depending on i m sorry sensors room failing, you might or may not must put the vehicle on jack stands. Park the vehicle on flat, level ground. Block the rear wheels. Disconnect the an unfavorable battery cable. Jack increase the front of the car and place the onto jack stands.

Figure 2. Jack under car.

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Step 2 - eliminate the sensor

You"ll need to locate the sensor you"re instead of first. Financial institution 2 Sensor 1 will certainly be close come the manifold accessible through the engine only (Figure 3). Financial institution 1 Sensor 1 is behind the engine before the main catalytic converter (Figure 4). The two other sensors are situated after the catalytic converters.

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

Follow the wires on the sensor you"re removing to the cable harness clip. Making use of a flat head screwdriver, pry up the clip tab and unplug it (Figure 5). Adhering to the wires back, there are small clips that store the wires from hitting the exhaust. Simply wiggle these and also they"ll come free pretty easily. Now, eliminate the old sensor through unscrewing it v the 7/8" wrench or the socket.

Figure 5. Wire harness clip.

Removing the sensors can be complicated depending ~ above the amount of rust that"s developed on the threads of these sensors. Use a generous amount of PB Blaster or something comparable to the threading, and allow it come sit because that a couple of hours. If girlfriend can"t control to get the wrench in place and also don"t have actually a slotted socket to permit the wires to happen through, girlfriend can cut the old wires best at the sensor and also use a regular deep socket on it.

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Step 3 - Install brand-new sensor

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