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DTC P0139: Secondary HO2S (Sensor 2) Slow Response

NOTE: Before you troubleshoot, record all freeze data and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
  1. Reset the ECM with the HDS (see ECM RESET ).
  2. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on.
  3. Check the HO2S S2 at 3,000 rpm in the DATA LIST with the HDS.

    Does the voltage stay within 0.3- 0.6 V for 2 minutes? 

    1. YES  - Replace the secondary HO2S (Sensor 2) (see SECONDARY HO2S REPLACEMENT , and the third HO2S (Sensor 3)* (see THIRD HO2S REPLACEMENT ).

      *: 2002-2006 M/T models

    2. NO  - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the ECM.
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