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I have a 1999 Ram 1500 could someone tell me how many oxygen sensors are on my truck I have found 2 someone told me theres 3 and if so I can find the other and 1 more question I think I have a bad sensor or sensors seem like it to me since running a little rich or lets say little rough would the check engine light have to come on when one or more sensors are but mine has not came on. Thanks for any input would help.
 

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racer21
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you only have 2 sensors, one on each side of the cat.
 

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X2.

IIRC only the California trucks had three.
 

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o2 dont have to trip codes. in the begining they may not. though the mileage will suffer slowly and you will see soot.
 
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