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.
Test Description
2004 Oldsmobile Bravada AWDSECTION Test Description
WARNING: This page is about a different car, the 2003 GMC Sonoma and 2003 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers on the diagnostic procedures.
- 2 - As the heater warms the O2S to operating temperature, the HO2S will output a voltage in relation to the amount of oxygen in the exhaust. With ignition on and engine off, the exhaust usually contains a high oxygen content. With the engine OFF the HO2S voltage will usually decrease from the initial or bias voltage due to the high oxygen content.
- 4 - This step checks for proper HO2S heater ignition 1 voltage and ground supply.
- 5 - This step checks for proper PCM and signal circuit operation.
RENDER: 1.0x
NO RELATED
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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.