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What causes High NOx in 94 Olds to fail state inspection?

Updated: 8/17/2019
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15y ago

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NOx in the emission system would be the engine temperature burning to hot there could be a couple of problems but most of the NOx problems are a failing egr valve it circulates air in the engine and exhaust to help keep he engines running temperature down i would say replace the egr valve and your set

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Q: What causes High NOx in 94 Olds to fail state inspection?
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