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#1 oxygen sensor

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Old 07-23-2012, 12:28 AM
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Default #1 oxygen sensor
1998 ram 2500 has been runnin rough so i had it scanned. The #1 oxygen sensor is bad. Is there a schematic that shows where this is located so i change the right one. Thanks
 
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Old 07-23-2012, 02:06 AM
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I believe its the pre cat sensor. I might be wrong so hopefully others will chime in soon.
 
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Old 07-23-2012, 02:37 AM
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Yes your truck should only have 2 oxygen sensors, one before cat and one after. #1 would be closest to the engine before the cat. Unless your truck has California emissions then #1 would be driver side.
 
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