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 2002 GMC Savana and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers in the diagnostic procedures.
- 2
This step determines if the condition is present. This test may take minutes for the diagnostic to run. For any test that requires probing the PCM or probing a component harness connector, use the J 35616-A Connector Test Adapter Kit. Using this kit prevents damage to the harness connector terminals. - 3
When DTCs P1134 and P1154 are set at the same time, fuel contamination is likely. - 4
An exhaust leak 6-12 inches (152-304 mm) from the HO2S can cause a DTC to set. - 5
This step tests the HO2S for being tight and determines if the connectors and circuits are okay. - 6
This step tests the integrity of the HO2S low signal circuit to the PCM. - 7
This step tests the integrity of the HO2S high signal circuits to the PCM. - 8
Certain gasket materials are made of room-temperature vulcanizing (RTV) silicone release vapors that can contaminate the HO2S. Silicon in the fuel can also cause silicone contamination. If the sensors appear silicone contaminated, and if all the silicone sealant is a non-silicone base, advise the customer to try a different fuel company. A missing fuel filler restrictor may indicate that the customer has used leaded fuel.
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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.