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 MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM - SELF-DIAGNOSTICS - 4.2LDIAGNOSTIC TESTSDTC P1134: HO2S TRANSITION TIME RATIO (BANK 1; SENSOR 1)CONDITIONS FOR RUNNING DTC
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Conditions For Running DTC
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Conditions For Running DTC
- DTCs P0105, P0107, P0108, P0112, P0113, P0117, P0118, P0122, P0123, P0125, P0128, P0201 P0202, P0203, P0204, P0205, P0206, P0300-P0306, P0336, P0440, P0442, P0446, P0452, P0453, P0506, P0507, P0601, P0602, P0604, P0606, P1120, P1220, P1221, P1271, P1275, P1280, P1441, P1484, P1512, P1514, P1515, P1516, P1621, P1635, P1639, P1680, or P1681 not set.
- ECT sensor parameter is more than 158°F (70°C).
- Engine speed parameter is 1000-2500 RPM.
- Ignition 1 signal parameter is more than 10 volts.
- Engine run time parameter is more than 200 seconds.
- Loop status parameter is closed.
- TP sensor Indicated Angle parameter is 5-30 percent.
- EVAP purge solenoid command is more than 10 percent.
- Fuel level sensor parameter is more than 10 percent.
- MAP sensor parameter is 7.4-31.0 in. Hg (25-104 kPa).
- Air flow calculated parameter is more than 16 g/s.
- Conditions are met for 60 seconds.
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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.