Only when it's either out of range or just plain out bad.
- Bernd
-----Original Message-----
From: Jay & Dana [mailto:jay&dana@telus.net]
Sent: Monday, February 25, 2008 4:16 PM
To: dakota-truck@dakota-truck.net
Subject: Re: DML: RE: OT Question: 97 Jeep trouble code
Thanks Bernd
If the rear O2 is bad or going bad, will it throw a code?
My truck only has 90,000 kilometers (55 or so thousand miles.) When the
dealer replaced my belly pan gasket they told me the front O2 was on it's
way out, but the rear was fine (at leat they were honest). And this was
summer of last year.
Thanks again
-Jay
> If it's that high mileage...yes, replace the rear O2 as well.
> Normally, the front O2 is what you should be concerned with as it's
> primary job is Fuel control. The rear also controls fuel delivery but
> is mainly there for catalytic monitoring.
>
> - Bernd
>
> -----Original Message-----
> From: Jay & Dana [mailto:jay&dana@telus.net]
> Sent: Monday, February 25, 2008 3:06 PM
> To: dakota-truck@dakota-truck.net
> Subject: Re: DML: RE: OT Question: 97 Jeep trouble code
>
>
> I've just replaced the front O2 sensor on my 97, 318, and was
> wondering about replacing the sensor after the cat. Does this one go
> bad, and if so what are the effects? I know the front one is the most
> important and I'm just wondering if and when the rear should be replaced.
>
> Thanks
> -Jay
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