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DTC P0133 - Front Ho2S Sensor

  1. Turn ignition on with engine off. Install scan tool to data link connector and check for DTCs. If DTC P0133 is present, go to next step. If DTC P0133 is not present, problem is intermittent. See INTERMITTENTS in TESTS W/O CODES article.
  2. Using scan tool, check lean/rich period. Scan tool display should read less than 2.6 seconds. If reading is as specified, go to next step. If reading is not as specified, replace front HO2S.
  3. After repairs, clear DTC. See CLEARING CODES under SELF-DIAGNOSTIC SYSTEM in TESTS W/CODES - INTRODUCTION article. Retest system. If DTC resets, replace ECM. If DTC does not reset, system is okay.
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