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Does P0138 mean I need an O2 sensor exactly?

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Old 03-11-2010 | 12:31 PM
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flyfishXJ
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Year: 1998
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Default Does P0138 mean I need an O2 sensor exactly?
So I went to Autozone and they pulled the code P0138, it says it could be a bad downstream O2 sensor. Could a bad O2 sensor be the only cause to throw this code? If not, what are my options? Please Help! Thanks
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Old 03-11-2010 | 12:32 PM
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From: Schererville, IN
Year: 1997
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Engine: 4.0
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other options could be an exhaust leak and the O2 is not mesuring correctly because of it.
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