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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 88 (ENGINE CONTROLS SELF-DIAGNOSTICS - 2.2L)DIAGNOSTIC TESTSDTC P0130: HO2S CIRCUIT (SENSOR 1)DIAGNOSTIC PROCEDURES
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Diagnostic Procedures

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Diagnostic Procedures
WARNING: This page is about a different car, the 2002 GMC Sonoma and 2002 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check, go to next step.
    2. NOTE: If any other DTCs are set, diagnose affected DTCs first. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
  2. Ensure engine is at normal operating temperature and operating at greater than 1200 RPM for 2 minutes. Using scan tool, observe O2S 1 voltage. Does the O2S 1 voltage read outside the specified range of 400-500 millivolts? If yes, go to next step. If no, go to step  4.
  3. Operate vehicle within the FAILURE RECORDS conditions. Does the DTC reset? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
  4. Check for exhaust leaks, improperly installed O2S 1, or damaged wiring. Repair as necessary. Did you find and correct the condition? If yes, go to step  13. If no, go to next step.
  5. Turn ignition off. Disconnect the O2S 1. Turn ignition on, with engine off. With a Digital Multimeter (DMM) measure the voltage on the PCM side of the O2S 1 high signal circuit to ground. Does the O2S 1 signal voltage measure about 450 millivolts? If yes, go to next step. If no, go to step  8.
  6. Install a jumper wire between the high signal circuit and the low signal circuit at the connector. With a scan tool, observe the O2S 1 voltage. Does the O2S 1 signal voltage measure about 0 millivolts? If yes, go to step  9. If no, go to next step.
  7. Test the low signal circuit for the following conditions: Open, high resistance or short to voltage. If a condition is found, repair as necessary. Did you find and correct the condition? If yes, go to step  13. If no, go to step  11.
  8. Test the high signal circuit for the following conditions: Open, high resistance or short to voltage. If a condition is found, repair as necessary. Did you find and correct the condition? If yes, go to step  13. If no, go to step  11.
  9. Check for poor connections at O2S 1 harness connector. Repair as necessary. Did you find and correct the condition? If yes, go to step  13. If no, go to next step.
    NOTE: Determine the cause of contamination before replacing the sensor.
  10. Check and test for fuel contamination or improper use of RTV sealant. Replace O2S 1. When complete, go to step  13.
  11. Check for poor connections at PCM connector. If a condition is found, repair as necessary. Did you find and correct the condition? If yes, go to step  13. If no, go to step next.
  12. Replace PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After replacing PCM, go to next step.
  13. Turn ignition on, with engine off. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Start engine. Operate vehicle within conditions for running this DTC. Does the DTC run and pass? If yes, go to next step. If no, go to step  2.
  14. With a scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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.