Replacing a faulty O2 sensor is not a daunting project, also for a novice DIY"er, as lengthy as you take it the proper precautions to stop accidentally burn yourself.

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This article applies to the Toyota Camry (1997-2011).

Your vehicle"s oxygen sensor procedures the oxygen contents in the exhaust, and adjusts engine parameters prefer the air-to-fuel ratio (AFR) to store it to run at that best. However, exhaust gasses are (by nature) hot and also dirty, so the sensor deserve to wear out through time. Speaking really generally, a expectancy of 100,000 miles have the right to be expected from the sensors. Therefore, as your auto ages, that is increasingly common that one O2 sensor will certainly go negative on your vehicle. A P0125 or P1335 code way that you have a poor O2 sensor. Because a faulty sensor can influence your fuel performance by in between 15 percent and 25 percent, you have to replace her sensor as soon as it fails.


Materials NeededNew O2 sensor22mm mix wrench or O2 sensor socket and wrenchMultimeter (optional)Welder"s glove (optional)

Step 1 – Prepare to change your O2 sensor

Let your car cool for a couple of hours before replacing your O2 sensor. The area of her engine wherein you"ll be functioning heats increase quickly, and also stays hot long after ~ you"ve turn off your engine. The longer you give your engine come cool before replacing your O2 sensor, the less likely you are to by chance burn yourself.

Step 2 – open up hood and also locate sensor

Open the hood and use the hood assistance rod to resolve in place.

Figure 1. Four cylinder Camry engine through sensor circled.

Identify the catalytic converter, and then look because that the two sensors (they look favor thick black color wires) the are associated to it. Over there is one (sensor 1) in prior of the catalytic converter and also a second (sensor 2) located behind and beneath the catalytic converter. Be certain to replace the exactly sensor (i.e., the sensor that has actually failed). Come make sure you do, consider testing each sensor through a multimeter by connecting each in turn to the multimeter (set to 200 ohms) to see if the sensor is "live."

Figure 2. Find the O2 sensor that is failing in order to replace it.
Figure 3. Usage a multimeter to verify the the O2 sensor is failing or has actually failed.

Featured Video: just how to inspect O2 Sensor

Step 3 – Disconnect O2 sensor native connector

Follow the "wire" indigenous the O2 sensor come the connector. In ~ the connector, pole one or two finger(s) behind the connector and push ~ above tab, while all at once pulling up on the connector. The should quickly pop the end of place.

Figure 4. Rod one or two finger(s) behind the connector and also push ~ above tab, while at the same time pulling up on the connector.

Step 4 – eliminate O2 sensor

Use O2 sensor socket to eliminate O2 sensor. To do so, slide "wire" right into slot on O2 socket and also then push socket down till it consists the O2 sensor. Once it does, attach ratchet come O2 sensor, which you"ll usage to loosen and also then ultimately remove the sensor. If your engine is warm, or to aid ensure friend don"t accidentally burn yourself, undertake a welder"s glove on one hand and also then use that hand to actually eliminate the O2 sensor when you"ve acquired it almost off through the O2 socket and also ratchet.

Figure 5. On slide the O2 socket end the wire, so that it fits snugly inside socket.
Figure 6. Slide O2 socket down the wire till it fits approximately sensor itself. Afterwards, connect ratchet to O2 socket.
Figure 7. Usage O2 socket and ratchet to ease O2 sensor. Then eliminate it.

Step 5 – add anti-seize on subject of brand-new O2 sensor

Rub a little anti-seize (likely contained with your new O2 sensor) ~ above the subject of the brand-new O2 sensor. This will aid you an ext easily remove the brand-new O2 sensor if you must so in ~ some allude in the future.

Figure 8. Include anti-seize come threads of brand-new O2 sensor (without getting any kind of on the sensor itself) to do removing it in ~ some point in the future easier.

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Step 6 – replace O2 sensor

Replacement is reverse of removal:

Position O2 sensor, thread right into hole, and tighten by hand till you cannot tighten that further.Use O2 socket and ratchet come tighten into place.Reconnect O2 sensor come connector by snapping it right into place.Finally, near the hood.

Featured Video: just how to Remove/Replace O2 Sensor