I have a 3rd generation 1999 Toyota 4Runner with 80,000 miles now. I would like to replace the oxygen sensor as well as the spark plugs. I have no clue where to start and searched in the forum here, but could not find any threads with step by step directions. Can anybody help? Thanks in advance.

 

You might want to order the O2 sensor through www.URDUSA.com. We have some kick ass prices on O2 sensor for the Tacomas and 3rd Gen 4Runners.

We also have a limited supply of Plat Spark plugs for your truck at a great price.

Gadget

 

You should be ok with a 99 model,but just in case ,you should check to see if you can remove the old sensor before tacking this, by making sure you an crack the nuts.I tried to take mine off,but couldnt get the nuts to move they were too old & rusted,the spanner ended up just rounding the nut.so now i have to wait untill i put my new exhaust system on ,since i will need all new pipe though there anyway i will have to do to jobs at once ,which means i need more money .... wheres that lotto ticket

 

I'm also interested in the directions to replace my 02 sensors. I have a 98 4Runner and it should be about the same as your 99. What can I use on rusted bolts to make them easier to take of?

 

Maddog, hehe. I was about to suggest that any maintenance that is likely to go wrong is worth taking to someone. Paying a few $ to have it put in is worth it as they will have to fix whatever they break, for free.

 

Help still needed. Thanks.

 

Jim, if you need step by step instruction to change spark plugs I honestly do not think you should go through with this. Especially since its not that easy on the V6's. But the step by step goes like this:

while (i=1; i<=6; i++) {
Locate i spark plug (counter clock loosens it)
i = (gap and apply anti-seize to new PLUG)
Torque correctly the new plug (clockwise)
}

 

Won't Toyota change the 02 sensor for free at 80,000 miles? I'm 95% sure I remember that from my 1990 Yota pickup manual. If so, don't let the mileage even hit 81,000. The local dealership refused the free change on mine with a few miles over that.

 

Deleted

 

That's really nice. I guess you just can't help SOME people. I hope the stealership charged you triple for the parts.

 

Is the cel on?....if not, then why worry about changing the O2 sensor? Just thoughts, but if it's not free then I'd wait until it went bad to change it out. Check here on the prices http://www.sparkplugs.com/results_app.asp
just my .02

 

Not sure what you are looking for in terms of a writeup for changing the sensor but it is very simple to do......2 nuts and a connector and the sensor comes right off. If it is frozen, you might have to use some PB Blaster and a propane torch to get them off. If you round off the nuts you can use something like this to get them off:

 

MTL, what is this tool and where can I get one? Thanks for helping out.

 

Sears is probably the more expensive place to get them but they are certainly sold there.
http://www.sears.com/sr/javasr/produ...&vertical=TOOL

You can also check Home Depot and Lowes to see if they have em cheaper.

For those of you up in the great white North, they also have them at Canadian Tire (my favorite store up here by far!)

 

I did mine last week (o2 from URD, the price rocks). Couple hours before I soaked the bolts in SeaFoam penatraing lube. Going bacl every so often and spraying, making sure it actually penetrates. Disconected the EFI fuse, pulled the clips apart on the sensor. Then I f rember right I either used 14mm or 12mm sockets to pull out the old one. Took the old o2 off, then the old o2 gasket. Wiped down the area of the sensor, checked for rust. Put the new o2 gasket on, put the new sensor on top of the gasket. Hand tightend the nuts, cliped in the new o2 into the old harness. Tightend it with the socket set. put the efi fues back in and your done. Easy as that hahaha. Good luck man, it was easy. Just be careful not to strip the nuts off when trying to remove it

 

Another thought for you guys, if you live in a rust belt, I might suggest using stainless nuts for replacement once you get the old rusty ones off just to make it easier the next time you service it, but always be sure to use an antiseize with stainless and do not get any on or near the sensor tip.

 

Suggestion:
Need to put IF or CASE statements inside WHILE LOOP to make it real. User Exit when it is -1 should give garage a ring. LOL.

 

I've done tuneups on a variety of vehicles, among other shade tree mechanical work. With the information available today, *Not* looking online for a writeup is choosing to ignore the advice and experience of others.

Here's a good writeup for swapping the plugs out on 3rd gen 4Runners:
http://4runners.org/writeups/sparkplugs/index.html

The main page of the site has other tech articles:
http://4runners.org/

 

Opie, you replied to a 2.5 year old thread.

Anyway, this is okay because I have a related question. Can I replace my stock o2 sensor with a wideband sensor? I ordered the NGK AFX kit and am wondering if I can use the included wideband.

David

 

Oops. Well, I didn't see the link I provided and figured that maybe others might benefit. What's a wideband sensor?