My Lincoln won't pass the smog test. The mechanic said to drive it 100 miles n it should pass. Done it, still won't pass. He said to drive for another 50 miles. He said he can't even get a code. Please help

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My Lincoln won't pass the smog test. The mechanic said to drive it 100 miles n it should pass. Done it, still won't pass. He said to drive for another 50 miles. He said he can't even get a code. Please help