Oxygen Sensor

I just went past 80k miles. Should I replace both my oxygen sensors?

 

I usually replace O2 sensors at 100,000 miles unless I get an error, but I inspect them every 20,000 miles.

...of course that is on all my older vehicles. My Tacoma shouldn't need that kind of maintenance for quite a while.

 

As a tech unless your sensors are throwing codes i wouldnt worry about it. I have been known to have been wrong before. but until our O2 sensors throw codes they are good to go

 

where are thw oxygen sensors located on an 04 v-6

 

locate the catalytic converter and there is going to be one in front and one behind it

 

thanks are they expensive and easy to change? or for that fact what goes wrong with them causing them to need to be changed?

 

on the 04 there is only one o2 sensor after the cats, the sensor before the cats is an air/fuel sensor. they are easy to change and some what expensive.

 

Why they go bad ia hard to say sometimes the sensors in them go out. Or they get trash of some sort or the wires go bad could be a number of reasons. the are not to hard to change you can get an o2 sensor socket or on the cars i work on a 22mm open end wrench is the right size. the only hard part is routing the wires back close to orginal location so they dont get damaged.

 

toyota uses 2 studs to hold the sensors in. use oem sensors because they are plug and play so you dont need to worry about the wires because they will be in the sock location. www.urdusa.com has oem denso sensors.

 

An air fuel sensor? Sure it's not a pre-cat O2 sensor--that the ECU compares with the post-cat O2 sensor, to verify cat operation?

 

looks like its normal to have to change the o2 sensors whenever they show code [lean bank one ] is it?
think this 2000 has afr and o2 but diagram doesnt show that but forum folks say they do, confused .
guess I'll check for vac leaks ,clean egr ,map and reset ,try again right ?
if this is the case will mileage improve considerably? used to get around 22 hiway ,now maybe 15 .

 

how does that differ from an O2 sensor? It seems like they would both be doing the same thing, as a wideband O2 sensor is used to measure A/F...Is it just a new name for the same old thing?

 

My O2 sensor for a 2nd gen cost about $150 for one!!!