Jim
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.
Bob
Burlington, Ontario, Canada
tigers@bserv.com
Current: '97 CC Sport, 5.2L, 3,55 auto., Gibson dual, K&N filter element.
'85 Shelby Turbo Charger, 2.2L, manual.
'70 Challenger, 383-4bbl, auto.
Past: '71 Road Runner, 340-4bbl, auto.
'70 Duster 340, auto.
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