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
This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 12:10:51 EDT