2006 Toyota Tacoma O2 Sensors

I am going to replace all 4 O2 sensors on my 2006 Toyota Tacoma V6 4.0L and wonder is it necessary to reset the vehicle computer after the installation, and if so what is the best way to do so?

I usually just disconnect the battery for a few minutes. You will have to disconnect the battery while you install the O2 sensors anyway. If you get any codes after that then the O2 sensors may not be your only problem.

You don’t need to disconnect the battery when replacing the O2 sensors. There’s no power to the sensors with the ignition switch off.

There’s no resetting of the computer required after installing the O2 sensors. Once the engine gets up to operating temperature and the computer goes into the closed loop mode the sensors will automatically send the proper signals.


Thanks for the clarification @Tester but I disconnect the battery for any maintenance that gets me near electrical connectors. I started doing this after welding a screwdriver to the frame while replacing my dad’s car horn.

I’m wondering why the need to replace all 4 of them.

Like @missileman, I routinely disconnect the battery negative ground before doing any serious wrenching. If the battery is even remotely in the way, sometimes I just completely remove it from the vehicle. Has saved my bacon more than once.

“I’m wondering why they need to replace all 4 of them.”

2 scenarios come to mind . . .


P0171 and/or P0174 . . . in this case, it’s possible somebody is shooting the messenger

I was thinking that replacing all of them sence I have a bad one was preventivitive maintenance and none of them were ever replaced to this point.

I don’t think its such a bad idea to replace these periodically if within reason, and I think 8-9 years is within reason. But do make sure that you’re not just assuming that a sensor is bad because of an error code. Its quite frustrating to got through the time/expense of something like that to then find out that you still have a problem. So if you want to check up on the diagnosis you could post the codes for discussion.

Usually O2 sensors are not replaced as part of preventive maintenance. Unless your owners manual schedule says they need replacement at this time and miles — or you have a specific reason to replace them, an air/fuel mixture related DTC or something – me, I wouldn’t replace them. Why? It’s always possible one of the new ones will be faulty, and you’ll be introducing a difficult to diagnose problem you didn’t have before. But as long as all the sensors you use as replacements work to spec, there is no harm done to replace them. Except to your pocketbook of course. To increase your odds, be sure to use OEM replacements for the O2 sensors. Folks here have told me Denso O2 sensors are what I should use for my 20 year old Corolla. I concur w/the above comments, there is no computer reset necessary. But it would be a good commonsense idea to disconnect the battery before doing the replacement job to limit the risk of damaging a sensor or the computer itself during the install.