Automotive Forums .com - the leading automotive community online! Automotive Forums .com - the leading automotive community online!
Automotive Forums .com - the leading automotive community online! 
-
Latest | 0 Rplys
Go Back   Automotive Forums .com Car Chat > Toyota > Highlander/Highlander Hybrid/Kluger
Reply Show Printable Version Show Printable Version | Email this Page Email this Page | Subscription Subscribe to this Thread
 
Thread Tools Search this Thread
Old 10-13-2017, 06:49 PM   #1
wdchparks
AF Newbie
 
Join Date: Mar 2005
Location: middleboro, Massachusetts
Posts: 36
Thanks: 1
Thanked 0 Times in 0 Posts
2006 Highlander P0420

2006 Highlander, 4Cyl, 110,000 miles, new plugs, new air filter. Code P0420 reset several times comes back. Read a lot from some knowledgeable people seems code is not defined as replace cat. I don't mind sending it to dealer for better tests than my scan tool, I just want to know what to ask for. I don't want to replace the O2 sensors since at that point costs add up.

Tires have proper air pressure, gas tank is full, and windows are up.

Thanks for any help
wdchparks is offline   Reply With Quote
Old 10-17-2017, 03:14 PM   #2
wdchparks
AF Newbie
Thread starter
 
Join Date: Mar 2005
Location: middleboro, Massachusetts
Posts: 36
Thanks: 1
Thanked 0 Times in 0 Posts
Re: 2006 Highlander P0420

The Plan

I read as much as I could on what was posted out on the wild web. I think I read the Pre O2 sensor controls the engine, and the post O2 sensor monitors the cat.

Since the code is ambiguous at best I am going to replace the post O2 sensor as soon as I can get my daughter to bring the car by. Also it seems my scanner does a little more than clear codes so I will read the data it holds when the code comes in.

As soon as I do it I will post back the results in a few days
wdchparks is offline   Reply With Quote
Old 10-18-2017, 12:19 AM   #3
Brian R.
Resident Chemist
 
Brian R.'s Avatar
 
Join Date: Feb 2004
Location: Rockville, Maryland
Posts: 8,528
Thanks: 101
Thanked 145 Times in 145 Posts
Send a message via Yahoo to Brian R.
Re: 2006 Highlander P0420

HO2 sensor is very often the problem. Good luck.
__________________
Forum Guidelines:http://www.automotiveforums.com/vbulletin/guidelines.html

"What we've got here is a failure to communicate"
Brian R. is offline   Reply With Quote
The Following User Says Thank You to Brian R. For This Useful Post:
wdchparks (10-23-2017)
Old 10-23-2017, 02:26 PM   #4
wdchparks
AF Newbie
Thread starter
 
Join Date: Mar 2005
Location: middleboro, Massachusetts
Posts: 36
Thanks: 1
Thanked 0 Times in 0 Posts
Re: 2006 Highlander P0420

Today I got my daughter to come by so I could change out the Post O2 sensor, she was two weeks behind in her laundry.

I also scanned first and the following set when code happened
Fuel Sys1 CL
Fuel Sys2 NA
Calc Load% 49.8
ECT F 187
STFT B1% 3.1
LTFT B1% 0.0
Eng RPM 1748
Vec Mph 39
Spark Adv 33.0
IAT Degree F 82
MAF Lbs/Min 1,0
TPS% 19.6

Honestly I cant tell you what most of it means but if O2 sensor doesn't cure it I will be learning. I will post again what happens. Hard to get college students to talk to except when payments are due.
wdchparks is offline   Reply With Quote
Old 10-23-2017, 03:01 PM   #5
Brian R.
Resident Chemist
 
Brian R.'s Avatar
 
Join Date: Feb 2004
Location: Rockville, Maryland
Posts: 8,528
Thanks: 101
Thanked 145 Times in 145 Posts
Send a message via Yahoo to Brian R.
Re: 2006 Highlander P0420

Also, if the HO2 sensor doesn't solve the problem, check for leaks in the exhaust system between the engine and the cat converter (loose connection, rusted area, or burned out seal)
__________________
Forum Guidelines:http://www.automotiveforums.com/vbulletin/guidelines.html

"What we've got here is a failure to communicate"
Brian R. is offline   Reply With Quote
 
Reply

POST REPLY TO THIS THREAD


Bookmarks

Tags
2006, highlander, p0420
Go Back   Automotive Forums .com Car Chat > Toyota > Highlander/Highlander Hybrid/Kluger

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



All times are GMT -5. The time now is 04:34 AM.

Community Participation Guidelines | How to use your User Control Panel

Powered by: vBulletin | Copyright Jelsoft Enterprises Ltd.
 
 
no new posts