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Code 13, Open Oxygen Sensor Circuit: Notes

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1990 Pontiac Grand Prix, 1990 Pontiac Grand Am, 1990 Oldsmobile Cutlass Supreme, 1990 Oldsmobile Cutlass Calais, and 1990 Chevrolet Beretta. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. The following conditions must exist to set a Code 13:
    • Engine running at least 40 seconds after start.
    • Engine coolant temperature greater than 108.5°F (42.5°C).
    • Code 21 or 22 must not be set.
    • Oxygen sensor voltage steady between .34 and .55 volt.
    • TPS signal greater than 6 percent for more time than less than 6% or about .3 volt greater than closed throttle voltage.
    • Conditions must be met and held for at least 20 seconds.
  2. This test will indicate whether sensor is faulty, or if wiring and/or ECM is cause of Code 13.
    NOTE: Use only high impedance digital volt/ohmmeter for this test.
  3. This test checks for continuity of circuits No. 412 and 413. If circuit No. 413 is open, ECM voltage on circuit No. 412 will be greater than .6 volt (600mV).
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