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.
Inspection/Maintenance Heated Oxygen Sensor Heater System Set Procedure: Procedure
2004 Oldsmobile Bravada RWDSECTION Procedure
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 Pontiac Grand Prix, 2003 Pontiac Bonneville, 2003 Chevrolet Monte Carlo, 2003 Chevrolet Impala, and 2003 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
- Perform INSPECTION/MAINTENANCE SYSTEM CHECK . After performing inspection/maintenance system check, go to next step.
- Preprogram scan tool with vehicle information before ignition is turned on. Verify vehicle is operating within Conditions for Running. Set vehicle parking brake. Ensure transmission is in Park. Turn off all of accessories. Start the engine. Allow engine to idle for 2 minutes or until I/M SYSTEM STATUS indicator updates to YES. Using scan tool, observe I/M SYSTEM STATUS display. If HO2S HEATER SYSTEM STATUS updated to YES, go to step 5. If HO2S HEATER SYSTEM STATUS did not update to YES, go to next step.
- Using scan tool, observe DTC information. If scan tool indicates any failed DTCs, see DIAGNOSTIC TROUBLE CODE INDEX table under DIAGNOSTIC TROUBLE CODE DEFINITIONS. If scan tool does not indicate any failed DTCs, go to next step.
- Refer to DIAGNOSTIC TROUBLE CODE INDEX to determine which DTCs are required to run in order to complete this test. Use the scan tool in order to observe the NOT RAN SINCE CODE CLEARED display. Determine DIAGNOSTIC AIDS .
- Using scan tool, check for DTCs. If scan tool indicates any DTCs are set, see DIAGNOSTIC TROUBLE CODE INDEX table under DIAGNOSTIC TROUBLE CODE DEFINITIONS.
NOTE:
If the ignition is turned on, ignition voltage is supplied to HO2S heaters. After verifying enable criteria, turn ignition off for approximately 5 minutes to allow sensors to cool before continuing with test.
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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.