O2 Oxygen Sensor For Buick Enclave Cadillac XLR SRX GMC Acadia 3.6L V6

Precision Stoichiometric Monitoring: GM LY7 & LLT 3.6L / 4.6L Northstar O2 Sensor

Who It’s For: Engineered for owners of GM’s Lambda and Sigma platform vehicles running the High-Feature 3.6L V6 (LY7/LLT) and the 4.6L Northstar V8 (LH2) who are experiencing fuel trim errors or a loss in fuel economy.

The Symptom: The factory oxygen sensors on the GM 3.6L and 4.6L engines are high-wear items that eventually "lazy out," responding too slowly to changes in exhaust gas composition. When these sensors degrade, your ECU can no longer accurately calculate the ideal air-fuel ratio, leading to a "rich" running condition. This manifests as a sluggish off-the-line feel, a noticeable "stink" of unburnt fuel from the tailpipe, and a steady decline in MPG as the vehicle struggles to maintain stoichiometry.

The Engineering Fix: This 4-wire heated oxygen sensor restores the critical feedback loop between your exhaust stream and the engine management system. Featuring a 520mm lead and a precision-calibrated internal ceramic element, it provides high-speed data transmission to the ECU. By accurately sensing the residual oxygen levels, it allows the computer to trim fuel delivery with surgical precision, cleaning up the combustion cycle and restoring the crisp throttle response these V6 and V8 powerplants were designed to deliver.

Why Mechanics Choose This Kit

• Rapid Closed-Loop Transition: The internal heater element is designed to reach operating temperature in seconds, allowing the engine to exit the fuel-heavy "open loop" startup phase faster.
• Signal Stability: Featuring a 520mm wire length with a high-temp outer sleeve, this sensor prevents signal interference and resists heat-soak in the cramped engine bays of the Acadia and Enclave.
• OEM Connector Geometry: This is a "Direct Fit" unit with the correct black 4-pin connector, eliminating the need for splicing which often introduces resistance and false CEL codes.

Technical Specifications

Compatibility & OEM Reference

Fits the Following Vehicles:

• 2009-2011 Buick Enclave V6-3.6 (Downstream)
• 2011 Buick LaCrosse V6-3.6 (Downstream)
• 2004 Cadillac CTS V6-3.6 (1st Design; Rectangular Upstream Connector; Downstream)
• 2004 Cadillac CTS V6-3.6 (2nd Design; Oval Upstream Connector; Downstream)
• 2004 Cadillac SRX V6-3.6 (1st Design; Rectangular Upstream Connector; Downstream)
• 2004 Cadillac SRX V6-3.6 (2nd Design; Oval Upstream Connector; Downstream)
• 2004-2005 Cadillac XLR V8-4.6 (w/ 21" Downstream Sensor; Downstream)
• 2009-2011 Chevrolet Traverse V6-3.6 (Downstream)
• 2009-2011 GMC Acadia V6-3.6 (Downstream)
• 2009-2010 Saturn Outlook V6-3.6 (Downstream)

Interchange Part Numbers:

75-3561, SG1380, SG1552, SG1582, 234-4816, OS2415, 15494, 16532, 16726, 75-2994, 75-3272, 213-1559, 213-1573, 213-2821, 213-3137, 213-4407, OS2213, OS2385

The Performance Promise

Buy with confidence. This sensor is built to survive the high-heat cycles of modern V6 engines and is backed by real automotive experts. Restore your vehicle’s efficiency and get back to peak performance with fast shipping from our shop.