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Code P013, Rear Oxygen Sensor Not Ready: Action

PCM turns on MIL and closed loop operation is disabled. PCM enables EVAP canister purge solenoid if Code P017 is also set.

NOTE: Test numbers refer to numbers on diagnostic chart.
  1. Voltage on PCM data parameter PD33 should fluctuate from less than 0.3 volt to greater than 0.6 volt. If voltage remain greater than 0.6 volt, check circuit No. 1670 for short to voltage. If voltage remains less than 0.3 volt, check circuit No. 1670 for short to ground.
  2. Measuring voltage using voltmeter will isolate sensor/wiring problem from a PCM problem. If voltage fluctuates at greater than 0.6 volt and less than 0.3 volt, fault is with PCM. If voltage remains less than 0.3 volt, check circuit No. 1670 for short to ground or circuit No. 1671 for short to voltage. If voltage remains greater than 0.6 volt, check circuit No. 1670 for short to voltage. If voltage remains 0.3-0.6 volt, check circuits No. 1670 and 1671 for an open.
Fig 1: Code P013 Schematic, Rear Oxygen Sensor Not Ready
G95F13248Courtesy of GENERAL MOTORS CORP.
Fig 2: Code P013 Diagnostic Flow Chart, Rear Oxygen Sensor Not Ready
G95C13252Courtesy of GENERAL MOTORS CORP.