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Home >> Saab >> 2001 >> 9-5 Base, 4D Wagon, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Fault Code Diagnosis >> P1131: O2S - Switch Point - Lean, Sensor 1 >> Fault Isolation Procedure
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Fault Isolation Procedure

  1. Changing components: Change Heated oxygen sensor 1. go to next step.
  2. Initiating diagnostics:
    • Check the diagnostic status of P0133 with the diagnostic tool.
    • Start the engine and run it at idling speed.
      • NOTE: Do not touch the brake pedal.
    • Let the engine run at idling speed until the coolant temperature exceeds 60°C and at least 3 minutes.
    • Observe what the diagnostic tool shows:
      • OK - The steps taken to rectify the fault were correct. Clear the DTCs in all systems.
      • NOT READY - The diagnosis has not yet been performed. Therefore, attempt to activate the diagnosis again by going back in the fault diagnosis to the section 'Initiating diagnosis'. Then continue fault diagnosis from there.
      • DTC - Diagnosis indicates that the fault is still present.
Fig 1: O2S Sensor Circuit (4-Cyl)
G00207349Courtesy of SAAB-SCANIA OF AMERICA, INC.
Fig 2: O2S Sensor 1 Circuit (V6)
G00207403Courtesy of SAAB-SCANIA OF AMERICA, INC.
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