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Originally Posted by Mustangman25
I don't think you mean nitrous oxide...that's a power booster used in some cars. You may mean sulfer oxide, or NoX (I can't remember what it stands for at the moment) which are emissions related gases.
How many miles on the car? A new catalytic converter could help, if not solve the problem.
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there is 200,000 miles on the car rebuilt engine at 189,000 NoX is almost double max allowed. all other emissions were quite low