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Q: Would a faulty catalytic converter cause the check engine light to come on? on 1990 Nissan Pickup (D21)

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I went in for a smog test to register my truck in CA. The mechanic said that the catalytic converter needed to be replaced so it failed smog. Would that cause the check engine light to come on as well?
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I know CA emission standards are higher than most of the other states so what they say is possible. My guess the state has a board that oversees that program and should have someone that can anwser questions and concerns that you may have.
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