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my van failed nj inspection for emissions and check engine light. on 2007 Chevrolet Uplander

A mechanic replaced cat converter, oxygen sensor and I replaced the gas cap. Still the engine light comes back on.

Asked by for the 2007 Chevrolet Uplander
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2 more answers
what are the codes you have?
when was the last time you changed plugs and wires they do last longer than in the old days but not forever