 OT, Oxygen sensor |
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| partwerks |
 Nov 28 2013, 04:05 PM
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#1
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Senior Member  Group: Members Posts: 1,593 Joined: 7-September 06 From: Grand Island, NE Member No.: 6,787  |
Is there any way to test to see if the oxygen sensor is working correctly?
I just put in the upstream and downstream sensors, and reset the code, but a couple days later, the code came back on. I double checked to make sure the electrical connection had not worked itself loose, but seemed ok. The auto parts store checked the code, and was the upstream. |
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| Mike Bellis |
Nov 28 2013, 04:09 PM
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#2
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Resident Electrician Group: Members Posts: 8,345 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None 
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O2 sensors put out a 0-1V signal, wide band O2 is 0-5V.
What is the code description? High, Low or invalid signal? Other engine conditions can make a high or low signal appear. |
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| partwerks |
Nov 28 2013, 04:25 PM
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#3
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Senior Member Group: Members Posts: 1,593 Joined: 7-September 06 From: Grand Island, NE Member No.: 6,787 |
The guy at the auto parts store just told me it was bank 1, which I guess is the upstream/front sensor.
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| Mike Bellis |
Nov 28 2013, 04:29 PM
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#4
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Resident Electrician Group: Members Posts: 8,345 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None
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QUOTE(partwerks @ Nov 28 2013, 02:25 PM)  The guy at the auto parts store just told me it was bank 1, which I guess is the upstream/front sensor. You need a real scanner or a proper code number to cross reference. The term "bank 1" only tells you a location. |
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| TheCabinetmaker |
Nov 28 2013, 04:36 PM
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#5
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I drive my car everyday Group: Members Posts: 8,301 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
You need the code# to determine the fault.
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| brant |
Nov 28 2013, 04:38 PM
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#6
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914 Wizard Group: Members Posts: 11,632 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains
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Yes.
With an ohm meter it kinda works. Technically an oscilloscope The fluctuation can be measured. You probably need a cat. What year, how many miles, any contamination (oil burn or leaded fuel or sea foam use?) |
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| partwerks |
Nov 28 2013, 04:56 PM
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#7
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Senior Member Group: Members Posts: 1,593 Joined: 7-September 06 From: Grand Island, NE Member No.: 6,787 |
96 VW Jetta. Used Sea Foam. I replaced the Cat about 5 years ago.
So, it may not even be the new sensors at this point? |
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| brant |
Nov 28 2013, 05:07 PM
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#8
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914 Wizard Group: Members Posts: 11,632 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains
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After market cats are often very short lifer. What brand did you use. Some of te cheaper brands have bee reported to have 12 month lifespans
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| partwerks |
Nov 28 2013, 05:59 PM
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#9
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Senior Member Group: Members Posts: 1,593 Joined: 7-September 06 From: Grand Island, NE Member No.: 6,787 |
I don't recall.
How does one know it is the cat, then, and not the sensors? |
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| brant |
Nov 28 2013, 06:14 PM
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#10
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914 Wizard Group: Members Posts: 11,632 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains
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By testing the sensors for laziness With an oscilloscope
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| partwerks |
Nov 28 2013, 06:19 PM
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#11
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Senior Member Group: Members Posts: 1,593 Joined: 7-September 06 From: Grand Island, NE Member No.: 6,787 |
Thanks.
I'll have my electrician take a look at it for me..? |
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| brant |
Nov 28 2013, 06:28 PM
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#12
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914 Wizard Group: Members Posts: 11,632 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains
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Pro auto shops will have a scope or be familiar enough to use an ohm
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| partwerks |
Nov 29 2013, 07:37 PM
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#13
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Senior Member Group: Members Posts: 1,593 Joined: 7-September 06 From: Grand Island, NE Member No.: 6,787 |
I had O'Reilleys reset the code, and it was PO131, Circuit-low voltage.
So far the light has not come back one since noon. I did take the connectors off, and hose them down with some MAF sensor cleaner, and pushed them back on hard, as maybe that could have been part of the problem, or not making good contact, I wonder?? |
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