How do I replace an a/f sensor in a toyota sienna 2003?

How can I replace an a/f sensor in a toyota sienna 2003? a Light came on, so the diagnostics said one of the a/f sensors were bad.How do I replace an a/f sensor in a toyota sienna 2003?More commonly called an o2 sensor (oxygen sensor). First, figure out which one. There are probably 2 front o2s (front meaning before the catalytic converter) and 2 rear o2s (rear meaning behind the catalytic converter). The front o2 sensors deal with air/fuel mixture, so its probably one of the fronts (or both). The rear o2s are part of the on board emissions.



But whichever one it is, all you do to replace them is unplug the wiring connector and unscrew it from the exhaust pipe, and then screw in the new one and plug in the connector. They may be hard to get out, so you may want to spray a penetrating oil on the threads.

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