P0143 - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

LinkBack Thread Tools Display Modes
post #1 of 6 (permalink) Old Jan 12th, 04, 04:31 PM Thread Starter
Join Date: Nov 2002
Posts: 22

96 V6

error code
P0143 02 Sensor Circuit Low Voltage (Bank I Sensor 3)

I was under the impression that I only had two 02 sensors; one in front of the cat and one behind the cat. So can anyone tell me where this sensor is? Is it one of the two that I said? SHould I just replace it or does this mean another problem?
MRB068 is offline  
Sponsored Links
post #2 of 6 (permalink) Old Jan 13th, 04, 02:10 AM
Senior Tech
Join Date: May 2002
Location: Kingsland, Georgia
Posts: 326

What kind of car?

Any O2 sensor that detects exhaust on cylinder #1 is identified as Bank 1 HO2S.

Sounds like you might have O2 sensors in the exhaust manifolds. If that is the case with single exhaust then Bank 1 - Sensor 3 is the one downstream (after) the catalytic converter.

Sounds like you have a scanner to read this code so you can try and clear it and see if it resets again or replace it. I've seen bad ones on new cars with low mileage.

Drew<br />69' X-11 Coupe
drew69 is offline  
post #3 of 6 (permalink) Old Jan 13th, 04, 03:36 PM Thread Starter
Join Date: Nov 2002
Posts: 22

it is a 96 camaro V6.
MRB068 is offline  
post #4 of 6 (permalink) Old Jan 14th, 04, 12:55 AM
Super Moderator
Bess-68's rule
Everett#2390's Avatar
Join Date: Sep 2000
Location: Va Beach VA
Posts: 31,620

You might find some info at www.OBDII.com
Everett#2390 is offline  
post #5 of 6 (permalink) Old Jan 14th, 04, 05:59 AM
Senior Tech
Join Date: Sep 2000
Location: Shrewsbury, MA, USA
Posts: 6,509

There,s probably 4 O2 sensors on your car, there is on my 96 4.3L Jimmy. 1 in each exhaust manifold, usually identified as bank 1 and bank 2 O2 sensor 1. Then there is one just before (bank 1 HO2 sensor 2), and one just after the cat (bank 1 HO2 Sensor 3). The only purpose of the last one is to monitor the efficiency of the cat. The ECM looks at the difference between the one infront of the cat, and the one behind the cat, and sets a code if the difference isn't greater than a set value.

It will eventually set the catalytic converter efficiency code. Does the car have about 100K on it? Thats about when my first cat went.

Mark Canning
1969 Indy Pace Car
350/300HP RPO Z11

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Mark C is offline  
post #6 of 6 (permalink) Old Jan 16th, 04, 10:01 AM
Tech Team
Join Date: Oct 2002
Location: Park City, UT, USA
Posts: 52

MRBO68 - Just because you got that code doesn't neccesarily mean that you have a bad o2 sensor! That scan tool will point you in the direction of the problem, then you have to go find it. A low voltage code could mean a battery problem, or you could have a wiring harness fault. Be careful.
tloleson is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome