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Will faulty O2 sensor cause check engine light to come on on 2002 ford expedition?
Wiki User
∙ 16y ago
Yes, a faulty O2 sensor will cause the check engine light to come on. Many auto parts stores will plug in an ODBII code reader to your Expedition to get the "trouble code" that tells you which sensor (there are 4) is faulty, free of charge.
Wiki User
∙ 16y ago
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