The O2 sensor keeps her truck to run at perfect efficiency. If her oxygen sensor is not providing the computer system accurate information, you have less power, less miles per gallon that gas, and more pollution coming the end of your tailpipe.

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This article applies to the Toyota Tundra (2000-Present).

The O2 sensor is responsible for measuring the air and fuel mixture coming out of the exhaust. It helps to make certain your van is running more efficiently. When an O2 sensor stop working, it deserve to not just hurt the performance of your truck, but it will reason a slim decrease in fuel efficiency and put up one of those annoying check engine lights. It"s likewise pretty necessary if you live in one area the does emissions testing, as it will reason you to fail the test. They space easy sufficient to replace yourself, every you need are the devoted sockets, i m sorry are available anywhere, and less than an hour of her time.


Materials NeededReplacement O2 sensorRatchet through 12mm and also 22mm O2 sensor sockets, and extensionAnti-seizeSafety glassesCode scanner (optional)

Step 1 – Read examine engine light trouble code

If girlfriend don"t desire to buy yourself an OBD-II password reader, be sure to acquire your check engine light code read at your local auto components store. It will tell girlfriend which the the four O2 sensors have to be replaced. Financial institution 1 way driver"s side, while financial institution 2 way passenger side; also, when it states sensor 1 it means the prior sensor and sensor 2 means the rear sensor. The front sensors space located prior to the catalytic converter, normally on the exhaust manifold and the rear sensors come after ~ the catalytic converter. Every one of them are in the exhaust plumbing in between the motor and also the tailpipe, under the truck.

Figure 1. Tundra cluster with the CEL lit.

Step 2 – remove the old O2 sensor


The exhaust gets very hot, and the catalytic converters can stay hot a long time after friend shut the truck off. So enable it come cool off to avoid obtaining burned.

One of the nice things about having a tuck is that you can get under that for simple projects like this without even jacking it up. Relying on how brand-new and clean her truck is, there might be no hazard of acquiring crud in your eye, or a near certainty, so placed on some safety and security glasses before messing approximately under there.

The O2 sensor is basic to identify. Just look because that the the plug sticking the end of her exhaust pipe through an electrical connector attached to it. Disconnect the electric connector very first by pushing in ~ above the tab ~ above the back of the connector. Then usage your O2 sensor socket to loosen the sensor indigenous the exhaust. The O2 sensor socket is favor a regular deep socket, but has an opening to slide the electrical cable through. This sensor have the right to be very hard to eliminate if there is rust and corrosion present, for this reason you may need a breaker bar, or impact gun. When you"ve loosened the O2 sensor, eliminate it from the exhaust.

Figure 2. Typical O2 sensor and socket.
Figure 3. Eliminate the old O2 sensor.
Pro Tip

You may have actually a tiny more an obstacle replacing the former O2 sensors, because they space harder to access. Use an expansion if you have actually trouble getting to them.

Step 3 – Install brand-new O2 sensor

Compare her old O2 sensor through your brand-new O2 sensor. They must be similar with the same length wire and also electrical connector. Prior to you object it right into the exhaust, it"s a an excellent idea to apply some anti-seize grease come the object on the sensor. This will make it much easier to remove later on on. After ~ that, subject it into the exhaust by hand till it"s firm, then turn it 1/2 come 3/4 the a turn more, or around 15ft/lbs. Reconnect the electric connector. Repeat these actions for any kind of O2 sensors you room planning top top replacing.

figure 4. Make sure your new O2 sensor matches the old one.
number 5. Install brand-new O2 sensor.

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Pro Tip

If after ~ this suggest the inspect engine light is still on, you have the right to either wait because that the truck to adjust to the brand-new sensor or you have the right to use a code reader to clean the code.