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First the answer to your second question. "Generally" the stated life of the O2 sensor is 100K. When one goes bad, the 'check engine light' should come on and the diagnostics from that should tell you which one is bad. If your vehicle has at least 100K, then you get into the "might as well as" area-if one is bad, could the others be far behind?

Replacement on your vehicle does not normally require the special socket for O2 sendors.

The number one upstream sensor is located between the motor and firewall, the number two upstream sensor is located between the motor and radiator, and the downsteam is located under the car. Replacing number one upstream and the downsteam sensor both require jacking up the vehicle to work from underneath. Replacement of the number 2 upstream sendor can be done with just the hood up.

First, unplug the sensor from the wiring harness.

Second, remove with a 22mm boxed or open end wrench.

Third, compare your purchase with the sensor that has been removed.

Replacement is the opposite of removal, install with 22 mm wrench and plug in.

You may have to disconnect the battery to clear the check engine dash lite and code.

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โˆ™ 2008-02-16 17:03:17
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Q: How do you replace the oxygen sensor in a 1999 Toyota Camry le v6 3 liter Do you need to replace both the upstream and downstream sensors?
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