There are 2 O2 sensors, 1 in each exhaust pipe just below the exhaust
manifolds, definately up stream. Also there is 1 located in the converter
body itself right between the dual inlet pipes on the inlet side, aparently
upstream also. 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.
>
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