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GM's 2005 list words this code "general, unleaded".
NF9 Factory-verified
Also described as Emission system, general, unleaded
Also documented for BuickCadillacChevroletGMCHummerOldsmobilePontiac
Documented applications
This page aggregates every documented appearance of NF9 in the Saturn reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.