User Tag List

Reply
 
Thread Tools Rate Thread Display Modes
Old 11-20-2019, 10:36 AM #1
DAWG NATION DAWG NATION is offline
Member
 
Join Date: Aug 2019
Location: Katy,TX
Posts: 71
DAWG NATION is on a distinguished road
DAWG NATION DAWG NATION is offline
Member
 
Join Date: Aug 2019
Location: Katy,TX
Posts: 71
DAWG NATION is on a distinguished road
Could Faulty O2 Sensor Cause Not Ready Emissions Reading

Hey Guys
Still trying to get Big Bertha to pass emissions. After many many miles and drive cycle still having not ready error from O2 and Catalyst.

Mechanic told me it may be a bad O2 sensor and he suggested I put in a new sensor.
Could he be right?

Thanks
DAWG NATION is offline   Reply With QuoteReply With Quote
Old 11-20-2019, 11:21 AM #2
ElectroBoy ElectroBoy is offline
Banned
 
Join Date: Nov 2017
Location: Bay Area, CA
Posts: 2,247
Real Name: Mark
ElectroBoy has a brilliant future ElectroBoy has a brilliant future ElectroBoy has a brilliant future ElectroBoy has a brilliant future ElectroBoy has a brilliant future ElectroBoy has a brilliant future ElectroBoy has a brilliant future ElectroBoy has a brilliant future ElectroBoy has a brilliant future ElectroBoy has a brilliant future ElectroBoy has a brilliant future
ElectroBoy ElectroBoy is offline
Banned
 
Join Date: Nov 2017
Location: Bay Area, CA
Posts: 2,247
Real Name: Mark
ElectroBoy has a brilliant future ElectroBoy has a brilliant future ElectroBoy has a brilliant future ElectroBoy has a brilliant future ElectroBoy has a brilliant future ElectroBoy has a brilliant future ElectroBoy has a brilliant future ElectroBoy has a brilliant future ElectroBoy has a brilliant future ElectroBoy has a brilliant future ElectroBoy has a brilliant future
Quote:
Originally Posted by DAWG NATION View Post
Hey Guys
Still trying to get Big Bertha to pass emissions. After many many miles and drive cycle still having not ready error from O2 and Catalyst.

Mechanic told me it may be a bad O2 sensor and he suggested I put in a new sensor.
Could he be right?

Thanks
You’re probably not meeting all the criteria for a “drive cycle”. Check out some of these threads below. Or Google search for a phrase like: “3rd Gen drive cycle catalyst ready”. There is also a TSB at this one:

Why might the catalytic converter monitor be not ready for CA mog test?

How To Perform a Toyota 4Runner 4.7L Drive Cycle?

I had this problem occasionally on my 3rd Gen also. The drive cycle completion resolved it, but you could need a new sensor. Good luck.

Last edited by ElectroBoy; 11-20-2019 at 11:26 AM.
ElectroBoy is offline   Reply With QuoteReply With Quote
Old 11-20-2019, 11:49 AM #3
Joelzy's Avatar
Joelzy Joelzy is offline
Member
 
Join Date: Apr 2018
Location: Layton, UT
Posts: 737
Joelzy is a glorious beacon of light Joelzy is a glorious beacon of light Joelzy is a glorious beacon of light Joelzy is a glorious beacon of light Joelzy is a glorious beacon of light
Joelzy Joelzy is offline
Member
Joelzy's Avatar
 
Join Date: Apr 2018
Location: Layton, UT
Posts: 737
Joelzy is a glorious beacon of light Joelzy is a glorious beacon of light Joelzy is a glorious beacon of light Joelzy is a glorious beacon of light Joelzy is a glorious beacon of light
i ended up with the catalyst code on the way to do emissions, new O2 sensor and about 50 miles(cranks here and there throughout) did it.
__________________
96 SR5 5SPD Elocker "the Barnacle"
–02 bmw 540i6
–19 Highlander SE
Joelzy is offline   Reply With QuoteReply With Quote
Old 11-20-2019, 12:21 PM #4
JMat's Avatar
JMat JMat is offline
Member
 
Join Date: Feb 2013
Location: Reno, NV
Posts: 220
JMat will become famous soon enough
JMat JMat is offline
Member
JMat's Avatar
 
Join Date: Feb 2013
Location: Reno, NV
Posts: 220
JMat will become famous soon enough
Quote:
Originally Posted by Joelzy View Post
i ended up with the catalyst code on the way to do emissions, new O2 sensor and about 50 miles(cranks here and there throughout) did it.
A new front O2 sensor did the same for me.
__________________
1998 Toyota 4Runner 3.4 4x4 with 340,000 miles.
199mm TBU-Bilstein 4600-'99 Tall Springs(Rear).Almost Totally Stock

1997 Toyota 4Runner 3.4 4x4 with 247k miles-Project car
JMat is offline   Reply With QuoteReply With Quote
Old 11-20-2019, 06:52 PM #5
DAWG NATION DAWG NATION is offline
Member
 
Join Date: Aug 2019
Location: Katy,TX
Posts: 71
DAWG NATION is on a distinguished road
DAWG NATION DAWG NATION is offline
Member
 
Join Date: Aug 2019
Location: Katy,TX
Posts: 71
DAWG NATION is on a distinguished road
Quote:
Originally Posted by Joelzy View Post
i ended up with the catalyst code on the way to do emissions, new O2 sensor and about 50 miles(cranks here and there throughout) did it.
Quote:
Originally Posted by JMat View Post
A new front O2 sensor did the same for me.
So after doing the drive cycle etc. You were still getting O2 Sensor and Catalyst "Not Ready" errors and only replacing the front O2 sensor fixed the problem?
DAWG NATION is offline   Reply With QuoteReply With Quote
Old 11-20-2019, 07:22 PM #6
JMat's Avatar
JMat JMat is offline
Member
 
Join Date: Feb 2013
Location: Reno, NV
Posts: 220
JMat will become famous soon enough
JMat JMat is offline
Member
JMat's Avatar
 
Join Date: Feb 2013
Location: Reno, NV
Posts: 220
JMat will become famous soon enough
Quote:
Originally Posted by DAWG NATION View Post
So after doing the drive cycle etc. You were still getting O2 Sensor and Catalyst "Not Ready" errors and only replacing the front O2 sensor fixed the problem?
Yes... Using my OBD2 reader I noticed it had said that for at least a year and wondered if it was something that wasn't supported so didn't worry too much. I finally decided to replace my upstream O2 sensor just because it had about 330k miles on it and within 20 minutes of driving it around the Catalyst read"Completed". Seems the Catalyst drive cycle is an pretty easy one unlike the Evap.
__________________
1998 Toyota 4Runner 3.4 4x4 with 340,000 miles.
199mm TBU-Bilstein 4600-'99 Tall Springs(Rear).Almost Totally Stock

1997 Toyota 4Runner 3.4 4x4 with 247k miles-Project car
JMat is offline   Reply With QuoteReply With Quote
Reply

Tags
catalyst , emissions , put , ready , sensor

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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 On

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Emissions tests keep resetting to not ready status... Majindan 3rd gen T4Rs 99 12-06-2017 06:25 PM
Faulty airbag sensor. Anyone else? Whitey13 4th Gen T4Rs 3 11-07-2015 01:30 PM
OBDII + Torque App. Question on Oxygen Sensor Reading. P0171 Code Related. nobb 3rd gen T4Rs 4 03-29-2013 03:40 PM
Im ready Im ready Im ready. Pics of the tires and cb Opi 3rd gen T4Rs 12 03-17-2011 05:21 AM
faulty air fuel sensor tcpoob 4th Gen T4Rs 7 02-14-2006 03:45 PM

Powered by vBadvanced CMPS v3.2.2

All times are GMT -4. The time now is 09:10 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.
Feedback Buttons provided by Advanced Post Thanks / Like (Lite) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Lite) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.
***This site is an unofficial Toyota site, and is not officially endorsed, supported, authorized by or affiliated with Toyota. All company, product, or service names references in this web site are used for identification purposes only and may be trademarks of their respective owners. The Toyota name, marks, designs and logos, as well as Toyota model names, are registered trademarks of Toyota Motor Corporation***Ad Management plugin by RedTyger
 
Copyright © 2020