YotaTech Forums  

Go Back   YotaTech Forums > Toyota SUV & Truck Tech > 95.5-2004 Tacomas & 96-2002 4Runners
Sign in using an external account
Register Forgot Password?
Search


95.5-2004 Tacomas & 96-2002 4Runners 4th gen pickups and 3rd gen 4Runners

Welcome to Yotatech!
Welcome to Yotatech,

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


Reply
 
LinkBack Thread Tools Search this Thread
Old 10-18-2003, 07:18 AM   #1
Registered User
Personal Sales Rating: (0)
 
heholaday's Avatar
 
Join Date: Oct 2003
Location: Alexandria, VA
Posts: 27
Question Is there a front O2 sensor on a 99 runner?

Still trying to find the front O2 sensor on my 99 runner. I've gotten some feedback that says it's supposed to be in front of the cat, but that's where my air/fuel ratio sensor is! I can't see anything else in the general area of the cat that looks like the sensor. I did, however find one a little further back (towards the muffler) that has a line running forward (towards the cat) could that be the one, or is that my rear 02 sensor? Please help!:pat:
This ad is not displayed to registered members.
Register your free account today and become a member on Yotatech!
heholaday is offline   Reply With Quote
Old 10-18-2003, 07:58 AM   #2
Registered User
Personal Sales Rating: (0)
 
Join Date: May 2002
Location: Southern MD USA
Posts: 1,539
Yes you have a sensor in front of the cat. It is either a standard O2 sensor or a air/fuel ratio sensor. You will only have one or the other infront of the cat and not both.

What kind of project are you working on.

Gadget

www.GadgetOnline.com
Gadget is offline   Reply With Quote
Old 10-18-2003, 08:12 AM   #3
Registered User
Personal Sales Rating: (0)
 
heholaday's Avatar
 
Join Date: Oct 2003
Location: Alexandria, VA
Posts: 27
o2 sensor

Ok, a few weeks ago my check engine light came on. I took it to the shop and they said the computer code was a front oxygen sensor. I called Todd at Toyota of Richardson, ordered the sensor - he looked the vin # up - sent it out. I put the sensor in last weekend - had to modify it because the grooves didn't line up with the slots in the "bung". Then I was informed on the forum that it was because that bung was for the fuel ratio sensor and that there was also a front o2 sensor somewhere. When I looked for it this morning, the only thing I could find was the one I described as being further back. Now what? Could the O2 sensor code really mean the fuel ratio sensor?
heholaday is offline   Reply With Quote
Old 10-18-2003, 08:23 AM   #4
Away
Personal Sales Rating: (0)
 
Dr. Zhivago's Avatar
 
Join Date: Oct 2002
Location: Beaverton, OR
Posts: 1,588
Send a message via ICQ to Dr. Zhivago Send a message via AIM to Dr. Zhivago
Yes, the O2 Sensor code actually means the A/F Ratio sensor. You will either have the A/F Sensor if your truck is a CA Emissions model, OR the O2 Sensor if your vehicle is a Federal Emissions model for that year, but not both.

After the 2000 model year, all 3rd Generation 4Runners came with the front A/F Ratio sensor.

Hope this helps.
Dr. Z
Dr. Zhivago is offline   Reply With Quote
Old 10-18-2003, 08:29 AM   #5
Registered User
Personal Sales Rating: (0)
 
heholaday's Avatar
 
Join Date: Oct 2003
Location: Alexandria, VA
Posts: 27
I've got a 99 4 runner. Todd looked up the VIN and sent the O2 sensor - not the fuel ratio sensor. How could this be if the VIN said o2 sensor? Ok, so I should order the fuel ratio sensor to take care of it, right? Can I put the O2 sensor he sent in the rear then?
heholaday is offline   Reply With Quote
Old 10-18-2003, 09:05 AM   #6
Registered User
Personal Sales Rating: (0)
 
Join Date: May 2002
Location: Southern MD USA
Posts: 1,539
The rear maybe a different part number.

Gadget

www.GadgetOnline.com
Gadget is offline   Reply With Quote
Old 10-18-2003, 09:09 AM   #7
Contributing Member
Personal Sales Rating: (0)
 
MTL_4runner's Avatar
 
Join Date: Jul 2003
Location: Montreal, QC Canada
Posts: 8,807
Send a message via AIM to MTL_4runner
You might as well replace the rear sensor with the one you modified as long as it was not damaged in the process. Check the numbers with the dealer to be sure that the sensors are the same behind the cat. Sorry to hear about your ordeal with the A/F sensor vesus the O2 sensor, but hey, we all make mistakes. I have certainly done my share of screwing things up as well.
__________________
- Jamie

1996 4Runner SR5 4X4 Auto

Deckplate Mod, Hayden Tranny Cooler, Amsoil Air Filter, OME 881/906 N86C/N91SC Lift

Best OBD II scan tool I have used!.

.....and I am AMERICAN!
MTL_4runner is offline   Reply With Quote
Old 10-18-2003, 09:09 AM
Yotatech
4WD Truck




Paid Advertisement
Reply

Tags
4runner, 99, af, front, o2, ratio, sensor, yotatech

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
'99 4Runner O2 sensor plug - how the hell do I get to it?? Hodag 95.5-2004 Tacomas & 96-2002 4Runners 8 06-08-2007 10:17 PM
99 Runner -- Can the front seats be switched? montypower 95.5-2004 Tacomas & 96-2002 4Runners 6 12-22-2006 07:40 PM
00 Tacoma O2 Sensor vs A/F Ratio Sensor ir-rocks 95.5-2004 Tacomas & 96-2002 4Runners 2 04-11-2006 03:49 PM
Symptoms of bad front O2 Sensor?? mikes97 95.5-2004 Tacomas & 96-2002 4Runners 0 03-15-2004 02:09 PM


All times are GMT -8. The time now is 03:45 PM.


2010 InternetBrands, Inc.