Welcome to the North American Subaru Impreza Owners Club Saturday July 26, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Archives > NASIOC Archives > General Forum Archive

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

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, free of charge, 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!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
 
 
Thread Tools Display Modes
Old 02-20-2001, 09:53 AM   #1
RugDoc2003
Scooby Newbie
 
Member#: 3628
Join Date: Jan 2001
Chapter/Region: MWSOC
Location: Kansas City, MO, USA
Vehicle:
2005 Impreza WRX STi
grey

Post How to tell if a O2 sensor is bad???

If heard that the O2 sensor is horible for malfunctioning in our cars... (MY00)

My question is, it seems like i get some crappy MPG numbers around town...
I drive strictly within the city and ussually shift below 3k rpm (though i do take it to redline every now and then )

but it seems as if i only get about 50 miles for every 1/4 tank. what gives?

please respond with your guys opinions.
thanks
anurag
* Registered users of the site do not see these ads.
RugDoc2003 is offline  
Old 02-20-2001, 09:54 AM   #2
RidinLow
Scooby Guru
 
Member#: 329
Join Date: Sep 1999
Chapter/Region: Tri-State
Location: NJ
Vehicle:
1995 325i
Arctic Gray

Post

If it's a dead sensor, you'll get a Check Engine light.
RidinLow is offline  
Old 02-20-2001, 09:57 AM   #3
Ian Cook
Scooby Newbie
 
Member#: 1228
Join Date: Apr 2000
Location: UK
Vehicle:
1993 Group N Impreza
White (Mostly) ;)

Post

My O2 sensor died on my car last year, the check engine light would come on for a couple minutes, then go out, car ran fine, was very thirsty though ! 150 miles from a tank ! took the car to the dealer, they put the select monitor on and it came up O2 sensor failure, changed it and started getting 220 - 230 miles from a tank ! Got a LOT of soot on the tailpipe too !
Ian Cook is offline  
Old 02-20-2001, 10:02 AM   #4
JayP
Scooby Newbie
 
Member#: 3125
Join Date: Dec 2000
Location: Bedford, DFW
Vehicle:
2001 Mustang Bullitt
Black

Post

I'm going in tomorrow for a 'CE' which I am presuming the O2 Sensor is flaked.

My car pops with some backfire pretty often and the tailpipe is sooty. My MPG is not as good as I would expect either.
JayP is offline  
Old 02-20-2001, 10:04 AM   #5
RugDoc2003
Scooby Newbie
 
Member#: 3628
Join Date: Jan 2001
Chapter/Region: MWSOC
Location: Kansas City, MO, USA
Vehicle:
2005 Impreza WRX STi
grey

Post

Ok so i haven't been getting what you guys say is a CE light at all...

so what should i be expecting out of a tank in the city.
thanks
RugDoc2003 is offline  
Old 02-20-2001, 10:15 AM   #6
JayP
Scooby Newbie
 
Member#: 3125
Join Date: Dec 2000
Location: Bedford, DFW
Vehicle:
2001 Mustang Bullitt
Black

Post

Has it ever been on? Mine came on for 2 days, went off for a few weeks-- then came on this morning.
JayP is offline  
Old 02-20-2001, 02:36 PM   #7
RugDoc2003
Scooby Newbie
 
Member#: 3628
Join Date: Jan 2001
Chapter/Region: MWSOC
Location: Kansas City, MO, USA
Vehicle:
2005 Impreza WRX STi
grey

Post

Mine has never been on other than when you start up the car (like normal).

But i ask this b/c i think i'm getting some crappy gas milage.

so now i'm just wondering if this is normal or if something is wrong.
anurag


RugDoc2003 is offline  
Old 02-20-2001, 03:01 PM   #8
MichiganRS
Scooby Specialist
 
Member#: 3069
Join Date: Nov 2000
Location: Harrison TWP Michigan USA
Post

Well if it gets to much carbomn built up it can be cleaned off with a torch so I am told.
Seeya
MichiganRS is offline  
Old 02-20-2001, 03:35 PM   #9
RugDoc2003
Scooby Newbie
 
Member#: 3628
Join Date: Jan 2001
Chapter/Region: MWSOC
Location: Kansas City, MO, USA
Vehicle:
2005 Impreza WRX STi
grey

Post

What does that have to do with the MPG i get?
I'm just trying to save some money from gas as my weekly allowence for it is being pushed.
thanks agian
RugDoc2003 is offline  
Old 02-20-2001, 04:22 PM   #10
ChosenWon
Scooby Specialist
 
Member#: 2236
Join Date: Aug 2000
Location: Red Sox Nation w/ y2k4door
Vehicle:
2000 Audi S4
silver/rally dirt brown

Post

When my CE light came on after only 3,500 mile I freaked! So I did some serious research at the best tech refereance place i could find. The i-club archives. I found that:

1. most sensors go out right around 2,500 -5,500 miles but as high as 7,700 miles (this last one was posted recently.)

2. Symptoms:
sooty tailpipe
CE light
Gradual (barley notice) performance loss over a week or so
seems to work harder at higher rpm's (hard to describe)

3. soemtimes you will get all of the above symptoms even though there is no CE light. This is due to a level of degragation of the sensor. it is not just a working or not working thing. your sensor can give you all the symptoms and not a ce light because it is funtioning at a minimal level. this is what you may have. This will still show up as a bad sensor on when the dealer does the read.

VERY IMPORTANT!: After the dealer replaces the sensor, YOU have to reset the ECU. They not only don't do it for you, but don't even tell you to do it yourself! I can't imagine what non I-cluber's do, but their car would run sluggish for days or weeks untill the ECU re-learned the new configuration. My hat off to Larry Ganz who reminded me after mine was replaced and i went whinning to him in the chat room that it was still sluggish. The next day it was ripping and roaring again. I could not believe the difference. it is amazing what you don't notice whenig goes gradually.
ChosenWon is offline  
Old 02-20-2001, 08:13 PM   #11
FargoRS
Scooby Newbie
 
Member#: 419
Join Date: Oct 1999
Location: Fargo, ND, USA
Vehicle:
2002 WRX

Cool

If your O2 is bad, you may not get a CE light. Symptoms can be poor gas mileage, sulfur smell(running rich), and finally erratic idle and stalling when the sensor really dies! If you have one of the earlier bad sensors that was supplied by Bosch, it might damage the ECM when it does fail. You can change O2s till your blue in the face and it won't fix the car. You need to change the ECM and O2 sensor. I believe there is a recall on the 2000 Impreza as well as other models. Someone posted some info on the general forum a few days ago. Also, I just had SOA buy back my 2001 Forester L because of the bad O2 plague.

My 99RS 5spd got about 270 miles per 13.8 gallons for city driving. Winter and hot rodding dropped to about 200-240 city (lots of warm ups or 6250 RPM). I got anywhere from 300-400 miles/13.8 gallons on the interstate. I found that a constant 55-60 on the interstate will get you almost 100 miles per quarter tank. Anything over will start to drop off again.

Mike

[This message has been edited by FargoRS (edited February 20, 2001).]
FargoRS is offline  
Old 02-20-2001, 08:26 PM   #12
dada21
Scooby Specialist
 
Member#: 383
Join Date: Oct 1999
Location: Gurnee, IL, USA
Vehicle:
2001 Outback Sport
Black

Post

My wife's 2001RS Auto had a bad O2 sensor in the first 1000 miles. Bad rotten egg smell and CE light. Took it in, 15 minutes later we were driving off.

The car STILL smells like rotten eggs when I drive it hard for short spurts. Maybe something got damaged? How to tell?
dada21 is offline  
Old 02-20-2001, 08:52 PM   #13
ChosenWon
Scooby Specialist
 
Member#: 2236
Join Date: Aug 2000
Location: Red Sox Nation w/ y2k4door
Vehicle:
2000 Audi S4
silver/rally dirt brown

Post

Good call on the rotten egg smell. Forgot about that one. Mine went away after a day or two though, but then again it was only on for about a week. My CE light came on the morning after driving briskly while a V8 dakota was driving briskly next to me. he liked my rear wing.

[This message has been edited by ChosenWon (edited February 20, 2001).]
ChosenWon is offline  
Old 02-21-2001, 05:34 AM   #14
FargoRS
Scooby Newbie
 
Member#: 419
Join Date: Oct 1999
Location: Fargo, ND, USA
Vehicle:
2002 WRX

Cool

I should add that when my Forester totally freaked out and started idling erratic and stalling, the temps were -10F to 10F above. You guys in warmer temps might not have such an extreme failure.

My 99 RS never smelled like Sulfur and my 2001 Forester didn't until 5K miles. Bottom line, a large number of O2s are bad, Subaru knows it, and they are recalling some models. Don't wait till they go bad, have your dealer check your sensor's serial number and lot number to make sure you don't have a bad sensor. A new revised part number has been issued.

Mike

[This message has been edited by FargoRS (edited February 21, 2001).]
FargoRS is offline  
Old 02-21-2001, 05:54 AM   #15
Retsyn
Scooby Newbie
 
Member#: 1910
Join Date: Jul 2000
Chapter/Region: NESIC
Vehicle:
2 Left Feet

Post

Just got mine replaced yesterday. I had a lot of those symptoms too. Crappy mileage, lots of soot and erratic idle. Still running a little weird, but I haven't had an opportunity to do the ECU reset yet...
Retsyn is offline  
Old 02-21-2001, 06:20 AM   #16
STiShawn
Scooby Specialist
 
Member#: 2348
Join Date: Sep 2000
Chapter/Region: MWSOC
Location: St.Louis
Vehicle:
2006 WRX TR
Steel Grey Metallic

Post

THANK YOU! Thank you for making this thread. I was getting concerned about this as my rear 02 sensor died last week, and yesterday a Fellow I club member was trying to convince me it was my MAF sensor, no malice towards him, we were both mis-informed. I will report what happens sat. after my sensor is changed. What is the process to get one of these off the exhaust? I couldnt for the life of me get it loose!
Having a moded 99 is like walking on glass, you neber know when your gonna get cut (by that G. Damn MAF sensor)
STiShawn is offline  
Old 02-21-2001, 06:36 AM   #17
Texas25RS
Scooby Guru
 
Member#: 3148
Join Date: Dec 2000
Chapter/Region: TXIC
Location: DFW, TX
Vehicle:
2012 Mazdaspeed 3
Crystal White Pearl Mica

Post

I get between 270 and 340 miles per tank depending on my mood and weekend plans.
Texas25RS is offline  
Old 02-21-2001, 09:13 AM   #18
t.rod
Scooby Specialist
 
Member#: 1447
Join Date: May 2000
Location: Austin, TX, US
Vehicle:
2000 Impreza
2001 Dodge 2500

Post

My gas milage has never been 270+. At the most on the highway I get 250. I'm going to have my dealer check it out.
t.rod is offline  
Old 02-21-2001, 09:22 AM   #19
blaster88
Scooby Specialist
 
Member#: 1109
Join Date: Mar 2000
Chapter/Region: MAIC
Location: Reston, VA
Vehicle:
1999 Suzuki Samurai
Blackish

Post

Had a CE light at 600 mi that was an O2 sensor, and then I got one just a little while ago that I figured was it again, because of the recall - however, this time it was A/F sensor. The service guy said I would get a letter to bring it back in for the O2 sensor - even htough it had already been replaced.
blaster88 is offline  
Old 02-21-2001, 09:40 AM   #20
RugDoc2003
Scooby Newbie
 
Member#: 3628
Join Date: Jan 2001
Chapter/Region: MWSOC
Location: Kansas City, MO, USA
Vehicle:
2005 Impreza WRX STi
grey

Post

Thanks for all the responses guys.

i'm not sure if i have a bad sensor or not but i think i seem to have some of the sypmtoms...

-my car seems to have crappy gas milage (maybe a little over 200/tank)
-sulfur smell during times of high rpm's

but no soot out of the tail pipe, no CE light, no rough idle's, and no declining performance (i think)

my car is a MY00 with 11,500 on it now... how do i check to see if the O2 sensor was recalled on this car?

thanks all
anurag
RugDoc2003 is offline  
Old 02-21-2001, 02:13 PM   #21
RugDoc2003
Scooby Newbie
 
Member#: 3628
Join Date: Jan 2001
Chapter/Region: MWSOC
Location: Kansas City, MO, USA
Vehicle:
2005 Impreza WRX STi
grey

Post

bump
RugDoc2003 is offline  
Old 02-21-2001, 04:16 PM   #22
rB5
Scooby Specialist
 
Member#: 1682
Join Date: Jun 2000
Chapter/Region: SCIC
Location: in my OBXT on the dead lawn
Vehicle:
'06 OBXT
Glacier White GF4

Post

FYI, i just got a letter from SOA for the O2 sensor recall (for '00 RS, Legacy and Foresters). It didn't specify if its all '00 cars or just certain VIN's, but you could have them check if yours is involved.
rB5 is offline  
 

Thread Tools
Display Modes

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
How to tell if my fuel pump is bad? Evegan Service & Maintenance 3 04-14-2005 06:17 PM
how to tell if a used flywheel is still good? Benjamin Tang Transmission (AT/MT) & Driveline 4 02-24-2004 03:21 PM
How to tell if car/engine/turbo is running the way it's supposed to? wrexsta Factory 2.0L Turbo Powertrain 4 02-18-2003 07:16 PM
How to tell if boost control solenoid is bad wackie Factory 2.0L Turbo Powertrain 5 11-05-2002 04:26 PM
How to tell if a steel wheel is a genuine part? Section 8 Brakes, Steering & Suspension 0 06-10-2002 08:53 AM


All times are GMT -4. The time now is 11:36 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.