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 MANUALSBUICK2010LUCERNE CXL, 3.9 1REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 320 (WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - ENGINE CONTROL MODULE X2 THROUGH PRESSURE CONTROL SOLENOID)COMPONENT CONNECTOR END VIEWSHEATED OXYGEN SENSOR (HO2S) 2
2010 Buick Lucerne CXL, 3.9 1
Heated Oxygen Sensor (HO2S) 2
2010 Buick Lucerne CXL, 3.9 1SECTION Heated Oxygen Sensor (HO2S) 2
WARNING: This page is about a different car, the 2011 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
Heated Oxygen Sensor (HO2S) 2
| Pin | Wire | Circuit | Function |
|---|---|---|---|
| A | 0.5 BN/PK | 3121 | HO2S 2 Low Signal |
| B | 0.5 PK/OG | 3120 | HO2S 2 High Signal |
| C | 0.8 GY/WH | 3122 | HO2S 2 Heater Low Control |
| D | 0.8 PK/BK | 5294 | Engine Main Relay Fused Control |
Connector Part Information
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Terminal Part Information
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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.