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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 83 (ENGINE CONTROLS - SELF-DIAGNOSTICS)DIAGNOSTIC TESTSDTC P1133: HO2S1 CIRCUIT - INSUFFICIENT SWITCHINGDTC PARAMETERS
1999 GMC Forward Control 5.7 R, Automatic

DTC Parameters

1999 GMC Forward Control 5.7 R, AutomaticSECTION DTC Parameters
WARNING: This page is about a different car, the 2002 Saturn LW200, 2002 Saturn L200, and 2002 Saturn L100. However, it is still accessible from the selected car via links, so may be relevant.
  • Engine running more than 200 seconds.
  • Engine speed 2350-3000 RPM (M/T) or 1800-2300 (A/T).
  • TP angle 22-40 percent (M/T) or 8-15 percent (A/T).
  • ECT more than 158°F (70°C).
  • Fuel level is more than 10 percent.
  • Evaporative purge is commanded to 80 percent or greater.
  • System in closed-loop mode.
  • No CKP, ECT, EVAP, fuel injector, fuel tank pressure, fuel trim or TP DTCs are set.

DTC sets when the number of rich-to-lean counts are less than one (A/T) or 2 (M/T), or lean-to-rich counts are less than one within 30 second test period.

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.