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Would a PCV valve cause nox emissions to be high I changed the egr vavle and still failed the test. Do you have any other suggestions. I really need to pass l993 altima.?
Wiki User
∙ 17y ago
Have you tried a fuel additive, Like techtron? You're suppose to put it in and drive out a full tank of gas. Or clean out the hose to the EGR valve.Or maybe, a new catylitic converter?
Wiki User
∙ 17y ago
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