Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 85 (ENGINE CONTROLS - SELF-DIAGNOSTICS - 2.2L)DIAGNOSTIC TESTSDTC P1134: HO2S1 - TRANSITION TIME RATIODTC 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 Vue. However, it is still accessible from the selected car via links, so may be relevant.
- Engine run time is more than 60 seconds.
- Engine speed is 1300-3000 RPM.
- TP angle is 3-35 percent.
- ECT is 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, IAT, idle speed, MAP, misfire, ECM internal fault, or TP DTCs are set.
DTC sets if HO2S1 rich-to-lean or lean-to-rich transitions are outside a calibrated range within 60 second test period.
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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.