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 MANUALSOLDSMOBILE2004BRAVADA RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 776 (ON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM])DTC P0038: MIDDLE HO2S HEATER CIRCUIT HIGH INPUTEXCEPT FOR CALIFORNIA EMISSION REGULATION APPLICABLE MODULE

2004 Oldsmobile Bravada RWD

Except for California Emission Regulation Applicable Module

2004 Oldsmobile Bravada RWDSECTION Except for California Emission Regulation Applicable Module

WARNING: This page is about a different car, the 2004 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: DTC P0038: Detection Condition & Possible Causes Chart

Courtesy of MAZDA MOTORS CORP.

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.