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yeh this might sound dumb but.. HOW MANY o2 SENSORS DOES A 99 MAXIMA HAVE AND WHERE ARE THEY LOCATED?
 

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Not a dumb question...
Fed-spec = 3 sensors
Cali-spec = 4 sensors

You can tell you have a cali-spec 99 by looking for a front pre-cat built into the header...there is also a swirl valve in the intake to help with emissions.
 
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