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.
Heated Oxygen Sensor (HO2S) 2
2006 Buick Terraza CXL, 3.5 L, AWDSECTION Heated Oxygen Sensor (HO2S) 2
WARNING: This page is about a different variant/trim than selected.
Engine Controls Connector End Views
Connector Part Information
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Terminal Part Information
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Heated Oxygen Sensor (HO2S) 2
| Pin | Wire Color | Circuit No. | Function |
|---|---|---|---|
| A | GY | 3122 | HO2S Low Signal - Sensor 2 |
| B | PU | 3120 | HO2S High Signal - Sensor 2 |
| C | TN/WH | 3121 | HO2S Heater Low Control - Sensor 2 |
| D | PK | 839 | Ignition 1 Voltage |
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.