o2 sensor problem - Chevy Cobalt SS Forum : Chevrolet Cobalt SS Forums
 
LinkBack Thread Tools Display Modes
post #1 of 8 (permalink) Old 08-28-2011, 06:45 AM Thread Starter
Junior Member
 
Join Date: Feb 2011
Posts: 5
o2 sensor problem

I have a 2005 Chevy cobalt LT that has a problem. I've replaced the front o2 sensor three times now in the course of 3 months. The cel keeps coming on saying its giving a bad reading. The catalytic convertor is brand new on it. The dealership replaced it about 7 months ago. What else could've making the o2 sensor go out? Once I replace it, its fine for about a month. Also, cold or wet weather occassionally turns the cel off.
ex0r is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old 08-29-2011, 01:59 PM
Moderator
 
RedSStreak's Avatar
 
Join Date: Feb 2009
Posts: 1,087
Garage
What kind of gasoline are you using??

Any questions about the Balt, all answered here:

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
RedSStreak is offline  
post #3 of 8 (permalink) Old 08-30-2011, 11:21 AM
Moderator
 
RedSStreak's Avatar
 
Join Date: Feb 2009
Posts: 1,087
Garage
Ok..........

Well since I asked that I will explain why. If you are running low octane gas, you are more than likely fouling your spark plugs causing you to run a bit too rich. When you run too rich, you foul the O2 sensors as well. However, if you run better than midgrade gasoline, you have stumped me. The only advice from me to you would to upgrade your O2 sensors if that is the case.

Solution: Check spark plugs and if fouled, replace immediately. And also change gas to premium upon next fill up and continue using premium grade. Run her a good bit redlining a couple times to release the excess CO2 that may be left in the catalytic converter.

Any questions about the Balt, all answered here:

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
RedSStreak is offline  
 
post #4 of 8 (permalink) Old 10-03-2011, 10:30 AM Thread Starter
Junior Member
 
Join Date: Feb 2011
Posts: 5
Premium gas in a 4 cylinder car? It says right in the book to not use premium gas. Since the last post, the problem has been intermittent, weather dependant.

The light will be off for 3 or 4 days, than suddenly one day out of nowhere turn on again. It depends on the weather the condition of the light or not. The spark plugs are fine, tested all of them. My wife told me one time she stopped suddenly for a red light and her 'BRAKE' light came on. Sounds to me like a short somewhere or something. Is there a common short/ground issue somewhere in these cars?
ex0r is offline  
post #5 of 8 (permalink) Old 10-06-2011, 05:08 PM
Moderator
 
RedSStreak's Avatar
 
Join Date: Feb 2009
Posts: 1,087
Garage
For your brake light issue, the fluid might be low. If not, have a shop diagnose the condition of the brakes.

And I only asked what type of gas is because it varies for the trim of the vehicle as well. If you have a SC (supercharger), of course you want premium gas. It is a forced induced vehicle that requires better combustion and a higher octane fuel will suit that with less residue on the spark plugs. But since you are an LT, it seems like it doesn't require to have premium. But it would be better to test to see if makes a difference. At only a couple cents more a gallon, it is a pretty cheap way to test. And since you have diagnosed the spark plugs, what brand are they? AC Delco is the original installed plug, ok for the vehicle but I have found out that E3 spark plugs burn the fuel more efficiently and result in better economy and less residue and longer life.

Any questions about the Balt, all answered here:

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
RedSStreak is offline  
post #6 of 8 (permalink) Old 10-19-2011, 07:28 AM
Contributing User
 
kromko52's Avatar
 
Join Date: Mar 2010
Location: Scranton, Pennsylvannia
Posts: 190
Send a message via AIM to kromko52
u r making it sound like putting 93 in a 4 banger is a bad idea lol all us guys who drive SS's must use 93 lol but i would go back to the dealer tell them exactily whats going on that its been replaced that many times because i believe it gets to a point when they keep replacing the same part and it goes bad it will usually fallow in your favor they did that with my other cobalt the MAF sensor kept getting screwed up and they actually gave my sister a new cobalt LT
Quote:
Originally Posted by ex0r View Post
Premium gas in a 4 cylinder car? It says right in the book to not use premium gas. Since the last post, the problem has been intermittent, weather dependant.

The light will be off for 3 or 4 days, than suddenly one day out of nowhere turn on again. It depends on the weather the condition of the light or not. The spark plugs are fine, tested all of them. My wife told me one time she stopped suddenly for a red light and her 'BRAKE' light came on. Sounds to me like a short somewhere or something. Is there a common short/ground issue somewhere in these cars?

435whp 402tq with the HAHN RACECRAFT SUPER 20G TURBO KIT
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
kromko52 is offline  
post #7 of 8 (permalink) Old 10-19-2011, 07:35 PM
Junior Member
 
Join Date: Oct 2011
Location: Central NC
Posts: 8
What brand of O2 sensor are you buying? BOSCH? If so, ask to see if you can get an NTK (NGK's brand). Also, make sure your connection on the plug-in does not have a bent terminal. (it happens)

Ask them. Tell them. Make them.
FiVo3 is offline  
post #8 of 8 (permalink) Old 10-24-2011, 04:44 PM
Moderator
 
RedSStreak's Avatar
 
Join Date: Feb 2009
Posts: 1,087
Garage
There are too many holes to this OP's description of the problem.

Any questions about the Balt, all answered here:

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
RedSStreak is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevy Cobalt SS Forum : Chevrolet Cobalt SS Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

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

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










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



Similar Threads
Thread Thread Starter Forum Replies Last Post
O2 sensor hkateh General Discussion 1 03-01-2010 08:17 PM
cooling temperature sensor ss4live General Discussion 2 10-03-2008 02:04 AM
getting rid of rear o2 sensor?? moose Tuning & Electronics 11 08-08-2006 09:28 AM
Air Intake Sensor Stuntman How To: 0 05-08-2006 04:52 PM
Temp. sensor EndZz Problems/Dealer Service 0 08-25-2005 02:22 AM

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