[Fwd: Re: Confused about O2 sensors on R/T]

From: Alan Short (ashort@flash.net)
Date: Fri Oct 30 1998 - 15:06:52 EST


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3-O2 sensors on my '98 R/T. One on each upper flange of the "Y" pipe
and one after the cat. Alan S.

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Date: Fri, 30 Oct 1998 11:45:48 -0500
To: dakota-truck@buffnet.net
From: Jack Hilton III <HEMI@charter.net>
Subject: Re: DML: Confused about O2 sensors on R/T
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Lemme check on that , I coullda sworn that there is one after the cat ?

  There are NONE behind the converter at all. This is not at
>all like my 98 was.
>
>> This info is from the '97 Dak service manual. Can't think of
>> a reason why it would not apply to the R/T.
>>
>> The manual says that there should be one near the oulet end
>> of the convertor.
>>
>> The upstream O2S sensor is located near the inlet end of the
>> cat. convertor. It "tells" the PCM the oxygen content of the
>> exhaust gas. The PCM uses this to fine tune the air/fuel ratio
>> by adjusting injector pulse width.
>>
>> The downstream heated oxygen sensor is located near the outlet
>> end of the cat. convertor. It is used to detect cat. convertor
>> deterioration. As the convertor deteriorates, the input from
>> the downstream sensor begins to match the upstream sensor input
>> except for a slight time delay.
>>
>> By comparing two inputs, the PCM calculates cat. convertor
>> efficiency. When convertor efficiency drops below emission
>> standards, the PCM stores a diagnostic trouble code.
>>
>
>
>
Jack Hilton

HEMI@charter.net

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