What is your question?
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What is your question?
took to mech and changed out 2 sensors one was the throtle position and the other a sensor under the air filter, plus he cleaned out the catalyaic converter and sid i need to replace in a month, but car still dies and rides rough, i say co2 sensors, but what do i know i give up , and i'm wasting a lot of money and the problem is'nt fixed if u can please help it's a 1997 nissan maxima tks.

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This is going to require a proper diagnosis, which it doesn't sound like you received from the mechanic you took it to. If your state has emissions testing, take it to a shop that performs these tests, they should be capable of handling this diagnosis. http://repairpal.com/nissan-repair-in-houston-texas