Re: check engine light on in 97 wrangler YJ with error code reading 72
 

On Tue, 16 Jan 2007 20:20:41 -0600, "DougW"
<post.replies@invalid.address> wrote:

>DougW wrote:
>
>> I've seen O2 sensors go bad, but not bad enough to set a fault. Usually it's the forward one and the only thing it does is give
>> you
>> bad milage and black exhaust. Figured the rearward one could go
>> equally bad and throw a code even if the cat was good.
>
>Actually that just made me think... if the forward O2 sensor
>is weak, the rear O2 sensor may very well call out a bad cat
>because the engine will be running rich.

Never seen an O2 fail causing a lean condition?

>
>Too bad there isn't an easy way to test O2 sensors.

Very easy with a DSO.

Re: check engine light on in 97 wrangler YJ with error code reading 72
 

On Tue, 16 Jan 2007 20:20:41 -0600, "DougW"
<post.replies@invalid.address> wrote:

>DougW wrote:
>
>> I've seen O2 sensors go bad, but not bad enough to set a fault. Usually it's the forward one and the only thing it does is give
>> you
>> bad milage and black exhaust. Figured the rearward one could go
>> equally bad and throw a code even if the cat was good.
>
>Actually that just made me think... if the forward O2 sensor
>is weak, the rear O2 sensor may very well call out a bad cat
>because the engine will be running rich.

Never seen an O2 fail causing a lean condition?

>
>Too bad there isn't an easy way to test O2 sensors.

Very easy with a DSO.

Re: check engine light on in 97 wrangler YJ with error code reading 72
 

On Tue, 16 Jan 2007 20:20:41 -0600, "DougW"
<post.replies@invalid.address> wrote:

>DougW wrote:
>
>> I've seen O2 sensors go bad, but not bad enough to set a fault. Usually it's the forward one and the only thing it does is give
>> you
>> bad milage and black exhaust. Figured the rearward one could go
>> equally bad and throw a code even if the cat was good.
>
>Actually that just made me think... if the forward O2 sensor
>is weak, the rear O2 sensor may very well call out a bad cat
>because the engine will be running rich.

Never seen an O2 fail causing a lean condition?

>
>Too bad there isn't an easy way to test O2 sensors.

Very easy with a DSO.

Re: check engine light on in 97 wrangler YJ with error code reading 72
 

bllsht wrote:
> On Tue, 16 Jan 2007 20:20:41 -0600, "DougW"
> <post.replies@invalid.address> wrote:
>
>> DougW wrote:
>>
>>> I've seen O2 sensors go bad, but not bad enough to set a fault.
>>> Usually it's the forward one and the only thing it does is give you
>>> bad milage and black exhaust. Figured the rearward one could go
>>> equally bad and throw a code even if the cat was good.
>>
>> Actually that just made me think... if the forward O2 sensor
>> is weak, the rear O2 sensor may very well call out a bad cat
>> because the engine will be running rich.
>
> Never seen an O2 fail causing a lean condition?

Oddly, no. All the ones I've seen have failed rich.


>> Too bad there isn't an easy way to test O2 sensors.
>
> Very easy with a DSO.

I have one of those. :)
http://www.revbeergoggles.com/temp/o-scope.jpg

Do you have a good reference for what the display should look like?

--
DougW

Re: check engine light on in 97 wrangler YJ with error code reading 72
 

bllsht wrote:
> On Tue, 16 Jan 2007 20:20:41 -0600, "DougW"
> <post.replies@invalid.address> wrote:
>
>> DougW wrote:
>>
>>> I've seen O2 sensors go bad, but not bad enough to set a fault.
>>> Usually it's the forward one and the only thing it does is give you
>>> bad milage and black exhaust. Figured the rearward one could go
>>> equally bad and throw a code even if the cat was good.
>>
>> Actually that just made me think... if the forward O2 sensor
>> is weak, the rear O2 sensor may very well call out a bad cat
>> because the engine will be running rich.
>
> Never seen an O2 fail causing a lean condition?

Oddly, no. All the ones I've seen have failed rich.


>> Too bad there isn't an easy way to test O2 sensors.
>
> Very easy with a DSO.

I have one of those. :)
http://www.revbeergoggles.com/temp/o-scope.jpg

Do you have a good reference for what the display should look like?

--
DougW

Re: check engine light on in 97 wrangler YJ with error code reading 72
 

bllsht wrote:
> On Tue, 16 Jan 2007 20:20:41 -0600, "DougW"
> <post.replies@invalid.address> wrote:
>
>> DougW wrote:
>>
>>> I've seen O2 sensors go bad, but not bad enough to set a fault.
>>> Usually it's the forward one and the only thing it does is give you
>>> bad milage and black exhaust. Figured the rearward one could go
>>> equally bad and throw a code even if the cat was good.
>>
>> Actually that just made me think... if the forward O2 sensor
>> is weak, the rear O2 sensor may very well call out a bad cat
>> because the engine will be running rich.
>
> Never seen an O2 fail causing a lean condition?

Oddly, no. All the ones I've seen have failed rich.


>> Too bad there isn't an easy way to test O2 sensors.
>
> Very easy with a DSO.

I have one of those. :)
http://www.revbeergoggles.com/temp/o-scope.jpg

Do you have a good reference for what the display should look like?

--
DougW

Re: check engine light on in 97 wrangler YJ with error code reading 72
 

bllsht wrote:
> On Tue, 16 Jan 2007 20:20:41 -0600, "DougW"
> <post.replies@invalid.address> wrote:
>
>> DougW wrote:
>>
>>> I've seen O2 sensors go bad, but not bad enough to set a fault.
>>> Usually it's the forward one and the only thing it does is give you
>>> bad milage and black exhaust. Figured the rearward one could go
>>> equally bad and throw a code even if the cat was good.
>>
>> Actually that just made me think... if the forward O2 sensor
>> is weak, the rear O2 sensor may very well call out a bad cat
>> because the engine will be running rich.
>
> Never seen an O2 fail causing a lean condition?

Oddly, no. All the ones I've seen have failed rich.


>> Too bad there isn't an easy way to test O2 sensors.
>
> Very easy with a DSO.

I have one of those. :)
http://www.revbeergoggles.com/temp/o-scope.jpg

Do you have a good reference for what the display should look like?

--
DougW

Re: check engine light on in 97 wrangler YJ with error code reading 72
 

Just took it in to the deealer today and they said they will replace
the cat under the recall, but that they are all on backorder. guess I
am pretty lucky to be getting it done at all for free

Bryan 97 TJ
DougW wrote:
> bllsht wrote:
> > On Tue, 16 Jan 2007 20:20:41 -0600, "DougW"
> > <post.replies@invalid.address> wrote:
> >
> >> DougW wrote:
> >>
> >>> I've seen O2 sensors go bad, but not bad enough to set a fault.
> >>> Usually it's the forward one and the only thing it does is give you
> >>> bad milage and black exhaust. Figured the rearward one could go
> >>> equally bad and throw a code even if the cat was good.
> >>
> >> Actually that just made me think... if the forward O2 sensor
> >> is weak, the rear O2 sensor may very well call out a bad cat
> >> because the engine will be running rich.
> >
> > Never seen an O2 fail causing a lean condition?
>
> Oddly, no. All the ones I've seen have failed rich.
>
>
> >> Too bad there isn't an easy way to test O2 sensors.
> >
> > Very easy with a DSO.
>
> I have one of those. :)
> http://www.revbeergoggles.com/temp/o-scope.jpg
>
> Do you have a good reference for what the display should look like?
>
> --
> DougW

Re: check engine light on in 97 wrangler YJ with error code reading 72
 

Just took it in to the deealer today and they said they will replace
the cat under the recall, but that they are all on backorder. guess I
am pretty lucky to be getting it done at all for free

Bryan 97 TJ
DougW wrote:
> bllsht wrote:
> > On Tue, 16 Jan 2007 20:20:41 -0600, "DougW"
> > <post.replies@invalid.address> wrote:
> >
> >> DougW wrote:
> >>
> >>> I've seen O2 sensors go bad, but not bad enough to set a fault.
> >>> Usually it's the forward one and the only thing it does is give you
> >>> bad milage and black exhaust. Figured the rearward one could go
> >>> equally bad and throw a code even if the cat was good.
> >>
> >> Actually that just made me think... if the forward O2 sensor
> >> is weak, the rear O2 sensor may very well call out a bad cat
> >> because the engine will be running rich.
> >
> > Never seen an O2 fail causing a lean condition?
>
> Oddly, no. All the ones I've seen have failed rich.
>
>
> >> Too bad there isn't an easy way to test O2 sensors.
> >
> > Very easy with a DSO.
>
> I have one of those. :)
> http://www.revbeergoggles.com/temp/o-scope.jpg
>
> Do you have a good reference for what the display should look like?
>
> --
> DougW

Re: check engine light on in 97 wrangler YJ with error code reading 72
 

Just took it in to the deealer today and they said they will replace
the cat under the recall, but that they are all on backorder. guess I
am pretty lucky to be getting it done at all for free

Bryan 97 TJ
DougW wrote:
> bllsht wrote:
> > On Tue, 16 Jan 2007 20:20:41 -0600, "DougW"
> > <post.replies@invalid.address> wrote:
> >
> >> DougW wrote:
> >>
> >>> I've seen O2 sensors go bad, but not bad enough to set a fault.
> >>> Usually it's the forward one and the only thing it does is give you
> >>> bad milage and black exhaust. Figured the rearward one could go
> >>> equally bad and throw a code even if the cat was good.
> >>
> >> Actually that just made me think... if the forward O2 sensor
> >> is weak, the rear O2 sensor may very well call out a bad cat
> >> because the engine will be running rich.
> >
> > Never seen an O2 fail causing a lean condition?
>
> Oddly, no. All the ones I've seen have failed rich.
>
>
> >> Too bad there isn't an easy way to test O2 sensors.
> >
> > Very easy with a DSO.
>
> I have one of those. :)
> http://www.revbeergoggles.com/temp/o-scope.jpg
>
> Do you have a good reference for what the display should look like?
>
> --
> DougW