Question about 2003 Ford Taurus

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Engine light came on. i have a programer and this is the code it read out to me po138 u2 (h02s-12) ckt (h1, s2)

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A code P0138 may mean that one or more of the following has happened:

  • Faulty O2 sensor
  • Short to battery voltage in O2 sensor signal circuit
  • High fuel pressure (not as likely)

Here are some potential solutions:
  • Replace O2 sensor
  • Repair short to battery voltage in o2 sensor signal circuit

Hope helps (remember to rate this).

Posted on Oct 14, 2010

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Posted on Jan 02, 2017

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