Replacing the O2 sensor
 

How hard is it to replace the front O2 sensor yourself? I've got a 99 runner and just had a new O2 sensor mailed to me...wondering if I should just eat the $70/hr labor charge at the shop.

Yourself
 

It's not difficult. It will require a 19mm wrench and some splicing tools I think. You wrench out the old one, cut it's wires (should be 4 of them -- heater +, heater ground, signal +, and signal ground), splice the new O2 sensor's wires in (be sure to solder connections), and then wrench it in. That's how mine is anyways. I'm not sure about the size of the wrench. I think it's 19mm, but I'm not sure. It's metric though for sure.

Zach

Use that flashing green button, lots of stuff on that here.

Actually though, you shouldn't have to splice anything unless yours didn't come complete with a connector, like mine did. Its just a plug n' play kind of thing.

you mean like this??
 

success!
 

Replaced the O2 sensor MYSELF this weekend guys...it's a breeze!! 1/2 job - only because the sensor that I had shipped from the dealer needed a little "modification" to get into the grooves on the existing 'female'(?) end. Pretty much plug and play like someone here said it would be!:bigok:

re: success
 

Sorry - meant 1/2 HOUR job...

Glad
 

Glad it worked out alright man, I always love the do-it-yourself feeling when I finish something.

Zach

Cool, glad it worked out for ya!

I found out that there are two types of sensors that fit in the front O2 bung. According to the dealer, one is an O2 sensor, the other is a Air/Fuel Ratio Sensor.

They have different grooves in the connectors.

When I called my dealer to replace mine, they asked for my VIN so they could determine which was the correct one. If you had to modify the connector, you probably have the wrong sensor. I found out I had the wrong one.

Hopefully your new sensor will work anyway. Good Luck!

Ken

O2 Sensor
 

Glad you got it in there Heather, was kind of worried after I spoke with you this morning. Let me know if you need anything else.

Todd

Spoke too soon
 

Todd, I believe I've got the wrong sensor! My truck is running like crap now - idling funny, surging, even at high speeds... I was about to email you when I read Ken's post about his situation and it being the air/fuel sensor. His experience with the "grooves" sounds exactly like what I was trying to describe to you yesterday.

After I got the old one off, I tried to match the numbers up - they're not the same. The number on my old sensor is 89467-35010. Let me know what you find out. By the way, am I hurting anything by leaving the one you sent in until we figure this out?:cry:

re: sensor
 

Also, is this the reason my "check engine" light is still on?

Re: re: sensor
 

I would bet money on it!

Re: re: sensor
 

Did you reset the computer after you replaced the sensor originally and now it is back on, did the light go off on its own and is now back on, or did it never go off at all?

O2 sensor
 

Ok first that is definitely your air/fuel ratio sensor. The part number has changed to 89467-35011 and your cost is 233.84 from me on that one. I thought your mechanic told you that you only needed the 02 sensor? I would definitely take that out and get the right thing in there Heather. I'm sorry when we spoke on the phone yesterday I was strictly thinking of an 02 sensor and not AFR sensor. Let me know what you want to do.

Todd :bang: :bang: :( :(

check engine light still on
 

Tom, the check engine light never went out....I think we've gotten to the bottom of this - it was the wrong sensor. I needed an air/fuel ratio sensor - got the O2 sensor instead.:cry: Ordering the air/fuel ratio sensor tonight from Todd...

I've got a "modified" O2 sensor if anyone is interested:welder:

I think this has already been answered but its easy to do. Took me 15 minutes...hit it with liquid wrench before though.

Hope it all works out for ya...

Fink:devil:

I just ordered an O2 sensor yesterday from 1sttoyotaparts.com Hope to get it by the weekend so I can install it. Hope mine goes as well as yours did Fink.

What is the part number for the gasket that goes with 89467-35011?

no and no


the nuts are 12mm and there is no splicing.