O2 Sensor diagnosis
01-25-2004, 05:31 PM
#2
Contributing Member
Join Date: Jul 2003
Location: Orlando, FL
Posts: 9,076
Likes: 0
Received 0 Likes
on
0 Posts
Welcome to the board man! 
Not sure how to check if its bad...but if you have a Check Engine Light on and are noticing performance decreases then its most likely bad...I would only go stock for the 02 sensor.
Fink
Not sure how to check if its bad...but if you have a Check Engine Light on and are noticing performance decreases then its most likely bad...I would only go stock for the 02 sensor.
Fink
01-25-2004, 05:33 PM
#3
Contributing Member
Re: O2 Sensor diagnosis
Originally posted by Dropwise Dunkle
Does anyone know how to test an Oxygen Sensor?? And if it's bad, where is the best place online to buy one?? Muchas Gracias!!
Does anyone know how to test an Oxygen Sensor?? And if it's bad, where is the best place online to buy one?? Muchas Gracias!!
I would get an OEM sensor but there are some aftermarket available online too.
01-25-2004, 10:59 PM
#5
Registered User
Join Date: Dec 2003
Location: Vista, Ca
Posts: 602
Likes: 0
Received 0 Likes
on
0 Posts
OxygenSensors.com.
Get the 'universal' O2 sensor, then plug it in where the stock one was, using the stock hardware.
Get the 'universal' O2 sensor, then plug it in where the stock one was, using the stock hardware.
01-26-2004, 04:35 PM
#7
Registered User
Join Date: Mar 2003
Location: Moncton NB, CA
Posts: 21
Likes: 0
Received 0 Likes
on
0 Posts
A good working O2 sensor should have a voltage that fluctuates between 200 and 800 mV. If it fluctuates in a narrower range (400 to 600mV), it means it's going bad.
remember to test the O2 sensor under normal operating temp, when under closed loop.
oh yeah, using an Analogue Multimeter would be better because digital multimeters can be slugish because of their low sample rate.
remember to test the O2 sensor under normal operating temp, when under closed loop.
oh yeah, using an Analogue Multimeter would be better because digital multimeters can be slugish because of their low sample rate.
Last edited by juicyfruity; 01-26-2004 at 04:37 PM.
Trending Topics
01-26-2004, 05:00 PM
#8
Contributing Member
Originally posted by juicyfruity
A good working O2 sensor should have a voltage that fluctuates between 200 and 800 mV. If it fluctuates in a narrower range (400 to 600mV), it means it's going bad.
remember to test the O2 sensor under normal operating temp, when under closed loop.
oh yeah, using an Analogue Multimeter would be better because digital multimeters can be slugish because of their low sample rate.
A good working O2 sensor should have a voltage that fluctuates between 200 and 800 mV. If it fluctuates in a narrower range (400 to 600mV), it means it's going bad.
remember to test the O2 sensor under normal operating temp, when under closed loop.
oh yeah, using an Analogue Multimeter would be better because digital multimeters can be slugish because of their low sample rate.
I have never seen an analog meter beat a digital one. Maybe the older digitals were slower but I have never had trouble capturing the variation in voltage on a DMM.
If you really want to see the readout from the sensor well use the OBD II reader in my sig.
Last edited by MTL_4runner; 01-26-2004 at 05:01 PM.
01-26-2004, 07:02 PM
#9
Registered User
Join Date: Mar 2003
Location: Moncton NB, CA
Posts: 21
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by MTL_4runner
I can't say I agree with this info at all. Yes, the sensor should be between 0 and 1volt anything outside that should trigger a CEL. An engine management system can fluctuate quite a bit or barely at all, so just stating 0.4 to 0.6V, you may throw out a good sensor. It also depends on which sensor you are looking at. The sensor in front of the cat varies alot more than the one behind the cat. A truly malfunftioning O2 sensor will almost always trigger the CEL. You can still replace and see if it helps as well.
I have never seen an analog meter beat a digital one. Maybe the older digitals were slower but I have never had trouble capturing the variation in voltage on a DMM.
If you really want to see the readout from the sensor well use the OBD II reader in my sig.
I can't say I agree with this info at all. Yes, the sensor should be between 0 and 1volt anything outside that should trigger a CEL. An engine management system can fluctuate quite a bit or barely at all, so just stating 0.4 to 0.6V, you may throw out a good sensor. It also depends on which sensor you are looking at. The sensor in front of the cat varies alot more than the one behind the cat. A truly malfunftioning O2 sensor will almost always trigger the CEL. You can still replace and see if it helps as well.
I have never seen an analog meter beat a digital one. Maybe the older digitals were slower but I have never had trouble capturing the variation in voltage on a DMM.
If you really want to see the readout from the sensor well use the OBD II reader in my sig.
Have you ever compared the readings from a Digital and an Anologue multimeter? You can't beat the response of an anologue multimeter.
Good to see a french(?) canadian on the board!
ps: he might not have OBDII, (started in 96) so he won't get a
check engine light
The one behind the cat is TOTALLY irrelevant to closed loop a/f control. It will only compare the reading with the front one to verify if there's more o2 (in %) present, so less unburt hydrocarbons...
Last edited by juicyfruity; 01-26-2004 at 07:20 PM.
Thread
Thread Starter
Forum
Replies
Last Post
Bourbonblues
86-95 Trucks & 4Runners
20
12-15-2017 05:43 PM
zz_denis
95.5-2004 Tacomas & 96-2002 4Runners
2
09-06-2015 03:43 PM
